TRACK TESTED STREET PROVEN
HI PERFORMANCE ENGINE PARTS
VOL 1.17
ROLLER ROCKER
APPLICATION GUIDE
OVER 50 YEARS of
PERFORMANCE INNOVATION
From humble beginnings in the early 1960’s “Dyno” Dave Bennett and his staff have built Yella Terra into
Australia’s leading manufacturer of roller rockers, performance cylinder heads, superchargers and billet
flywheels.
As a company, Yella Terra has always been committed to constant product improvement through motor
sport involvement. From success in the early days of drag racing, to milestone developments in alloy
head and roller rocker design proven over millions of trouble free race kilometers in Australian touring
car and circle track racing.
The success of Yella Terra has not been restricted to Australia. Today, Yella Terra produce private label
hi-performance engine parts for the USA, its totally unique roller rocker designs proving an instant
success when released in the USA during the early 1980’s. In recent times, Yella Terra Platinum series
race rockers have developed a dedicated following amongst US race engine builders.
Yella Terra’s expertise in product design and advanced CNC manufacturing techniques have earned the
company a reputation as an efficient and reliable source for a large range of components required by the
automotive and general industries.
2 | YELLA TERRA
INDEX
Rocker Arm Styles............................................................................................................................................ 4-5
Mounting Styles................................................................................................................................................. 6-7
Why Choose Yella Terra?.............................................................................................................................. 8-9
Application Guide
AMC V8......................................................................................................................................................... 10
BMC INLINE 4........................................................................................................................................... 10
BUICK V6..................................................................................................................................................... 11
BUICK V8..................................................................................................................................................... 10
CADILLAC V8 BIG BLOCK..................................................................................................................... 10
CHEVROLET V6........................................................................................................................................ 18
CHEVROLET V8 BIG BLOCK.......................................................................................................... 18-19
CHEVROLET V8 LS1, LS2, LS4, LS6............................................................................................ 15-16
CHEVROLET V8 LS3, LS9, LSA, L98............................................................................................ 16-17
CHEVROLET V8 LS7, LSX............................................................................................................... 17-18
CHEVROLET V8 SMALL BLOCK.................................................................................................. 12-14
CHEVROLET V8 SMALL BLOCK LT1................................................................................................. 11
CHRYSLER INLINE 6............................................................................................................................... 20
CHRYSLER V8 MOPAR............................................................................................................................ 20
FORD ESSEX V6........................................................................................................................................ 21
FORD INLINE 6.................................................................................................................................. 20-21
FORD V8 CLEVELAND & BIG BLOCK................................................................................................ 21
FORD V8 WINDSOR......................................................................................................................... 22-23
HOLDEN INLINE 4.................................................................................................................................. 26
HOLDEN INLINE 6.................................................................................................................................. 24
HOLDEN V6................................................................................................................................................ 11
HOLDEN V8......................................................................................................................................... 25-26
JEEP INLINE 4........................................................................................................................................... 26
JEEP V6........................................................................................................................................................ 26
NISSAN/DATSUN INLINE 4................................................................................................................. 26
OLDSMOBILE V8...................................................................................................................................... 27
PONTIAC V8............................................................................................................................................... 27
ROVER V8.................................................................................................................................................... 10
STUDEBAKER V8..................................................................................................................................... 28
VOLVO INLINE 4....................................................................................................................................... 27
Footnotes................................................................................................................................................................ 29
Mounting Hardware & Spares............................................................................................................. 30-33
YELLA TERRA | 3
ULTRALITE
ULTRALITE PRO
FACTORY REPLACEMENT/ STREET
Late model V8 and V6 engines that run factory light weight valvetrain components are often subject to
valve float in the upper RPM range, limiting the engines performance and full potential. Yella Terra’s
engineering team set out to find a solution to the problem, and the result was the Ultralite.
Yella Terra’s exclusive Ultralite rocker arm, shaft and pedestal system offers 50% less nose weight than
the factory rocker system, the result being greater RPM potential, with the added advantage of improved
strength and durability. Also available in Ultralite Pro (widebody design).
MAX Open Spring Pressure: 400lbs*, 480lbs* for Ultralite Pro
MAX spring diameter: 1.550”
Lifter Compatibility: Hydraulic kits are designed specifically for use with hydraulic
lifters. Adjustable kits are designed for use with both hydraulic
and mechanical (solid) lifters.
STREET TERRA
FACTORY REPLACEMENT / STREET
The best value rocker arm on the market today. Engineered to meet or exceed the needs of performance
street and sportsman race applications running a maximum open valve spring pressure of 450lb*.
Designed and engineered for optimum strength, the Street Terra vacuum die cast roller rocker features
the extreme duty hardware from our premium Platinum series, including oversize ground trunnions
and needle roller bearings, ensuring years of trouble free performance and durability.
No comparable product can claim this combination of critical features. Available in both traditional stud
mount designs for use with pushrod guide plates and rocker studs, and our unique EASY FIT bolt-on
sets that can be fitted in about one hour with no head removal or machining required. Street Terra EASY
FIT kits are also a cost effective replacement for factory stamped steel rocker arms on standard or mild
street engines.
MAX Open Spring Pressure: 450lbs*
MAX spring diameter: 1.550”
Lifter Compatibility: Hydraulic kits are designed specifically for use with hydraulic
lifters. Adjustable kits are designed for use with both hydraulic
and mechanical (solid) lifters.
4 | YELLA TERRA
PRO STREET
STREET / STRIP
Featuring aircraft grade, extruded aluminum rocker arms that will handle open spring pressures up to
600lbs*, the Pro Street range has been designed for use in high revving street/strip applications.
The Pro Street rocker arm is supported by the same hardware used in our severe race Platinum series,
including massive ground trunnions that have been machined to accommodate oversize needle roller
bearings. The ground finish on our trunnions offers smoother operation, lower friction and better
bearing compatibility than the machined finish used with comparable products.
MAX Open Spring Pressure: 600lbs*
MAX spring diameter: 1.550”
Lifter Compatibility: Hydraulic kits are designed specifically for use with hydraulic
lifters. Adjustable kits are designed for use with both hydraulic
and mechanical (solid) lifters.
PLATINUM
STRIP / RACE
Some years ago, we set out to create the world’s strongest roller rocker, with the highest RPM potential,
and the successful result was the Platinum series.
Engineered for the most severe race applications on the planet, Platinum rockers feature “wide body”
arms for even greater strength and resistance to deflection. Capable of handling open spring pressures
in excess of 900lbs, all platinum rockers feature heavy-duty 7/16” mountings for unsurpassed rocker
stability.
Platinum rockers are available in twin shaft versions for parallel valve applications and unique single
shaft designs for canted valve cylinder heads. The Platinum range covers most popular factory and
aftermarket performance heads in a choice of ratios and offsets.
MAX Open Spring Pressure: 900lbs*
MAX spring diameter: 1.550”
Lifter Compatibility: Designed for use with both hydraulic and mechanical (solid) lifters.
*Listed spring pressures may vary depending on camshaft lobe intensity and lift.
YELLA TERRA | 5
STUD
YT 5010
Traditional stud mount rockers are designed to use either original or heavy duty screw in oversize studs
when machining is required. Available in adjustable versions suitable for mechanical and hydraulic
camshafts. Guide plates, hardened pushrods and stud girdles may be necessary with these rockers.
We highly recommend fitting shaft or pedestal mount designs where possible to eliminate these
requirements.
SHAFT
YT 6640
No stud mount rocker arm can match the strength, rigidity, stiffness, or ability to take the rigorous
punishment that a good quality shaft mount rocker arm can. When utilising higher spring pressures
and/or popular rapid accelerating cam lobe profiles, a shaft mount rocker arm should be the only choice.
6 | YELLA TERRA
PEDESTAL
YT 6321
A truly unique rocker design - no other manufacturer offers such a simple to fit assembly. The design
registered pedestal bolts directly to the original mounting holes and positively locks the trunnion in
precise relationship to the valve stem. Provides an extremely rigid rocker, available in non adjustable
versions for hydraulic camshafts only and adjustable versions for both mechanical and hydraulic
camshafts.
MODULAR
YT 6743
The modular system is designed to replace the standard shaft type rockers on a variety of engines. There
are a number of versions to suit specific engines some utilizing the standard shafts and hardware and
others complete with CNC cradle, shafts, rockers and all necessary mounting hardware (pictured above).
YELLA TERRA | 7
WHY CHOOSE ROLLER ROCKERS?
GREATER STRENGTH Our arms are infinitely REDUCED HEAT The reduction in friction that
stronger than standard stamped steel arms roller rockers create has an additional benefit of
reducing the operating temperature and foaming
providing the best resistance to bending and
breaking under high spring pressures and/or effect of engine oil to provide safe lubrication in
radical cam profiles at high RPMs. high stress applications.
Stamped steel rocker arms, in high performance REDUCED VALVE SEAT WEAR The traditional
applications, are prone to failure. A high rate of metal tip on standard rockers literally drags across
fulcrum wear, flexing, cracking, splitting, and
breakage are common problems that will result the valve tip as the rocker opens and closes causing
in power loss or possible piston failure due to high side loading on the valve. This side ward force
detonation of the incoming air/fuel charge. leads to irregular and rapid valve, valve guide
and valve seat wear in many engines. The roller
Other Yella Terra rocker components such as the tip on Yella Terra and Street Terra roller rockers
trunnions, polylocks and bearings greatly enhance
valvetrain durability in performance applications. eliminates this side loading action, as a result
engines rev quicker and freer with a crisp exhaust
note.
VARIOUS ROCKER ARM RATIO CHANGES VALVETRAIN ADJUSTMENT Use of high
Higher ratio rockers produce more lift out of a performance hydraulic or mechanical camshafts
given cam profile, lift the valve off the seat at a requires some form of valvetrain adjustment to
achieve correct clearance and geometry. Adjustable
much faster rate than stock rockers to initiate and roller rockers allow these corrections to be made
sustain increased airflow, and can also increase quickly and easily.
horsepower and torque.
Higher ratio rockers limit the lifter travel which VALVETRAIN STABILITY Yella Terra and Street
reduces internal friction and lifter/pushrod inertia, Terra EASY FIT shaft and pedestal designs offer the
which in turn can allow for the use of lighter valve most rigid rocker system without using restraining
springs due to the increased leverage effect of devices such as guide plates, screw in studs and
the high lift rocker arm upon closing the valve. stud girdles. The result is more consistent valve
When changing rocker arm ratios on your engine lift and vastly improved valvetrain reliability at a
to a higher ratio, not only does the gross valve lift substantially lower cost.
increase, but the duration at the valve in the higher
lift ranges also grows. MORE POWER THROUGH LESS FRICTION
The use of needle roller bearings at the rocker
Benefits of this geometry include: fulcrum combined with a roller tip at the valve
• Increased flow into the cylinder earlier in the greatly reduces horsepower robbing friction in the
valvetrain to provide a measurable power increase
cycle over standard systems.
• Quicker closing of the valve to trap cylinder
pressure before combustion
• More effective duration at .200” net valve lift,
while maintaining a relatively short seat-to-
seat timing
• Less required valve spring seat pressure
because of the mechanical advantage of the
higher seat ratio.
8 | YELLA TERRA
WHY CHOOSE YELLA TERRA?
AUSTRALIAN DEVELOPMENTS & SUCCESS WARRANTY Yella Terra warrants that, subject
In 1982 Yella Terra recognised the need for a to the exclusion and limitations listed on the Yella
superior roller rocker and visualised a wider Terra web page, the product will be free from
range of designs, and developed a totally new defects in materials and workmanship for the
duration of the applicable warranty period as
concept of the bolt-on rocker for the performance specified on the warranty statement located on
market, now called EASY FIT or EF. The new the www.yellaterra.com.au website. Yella Terra
design eliminated the unnecessary cost that were roller rockers carry a 12 month general warranty,
attached to traditional set-ups. Yella Terra rockers plus limited lifetime warranty against breakage of
are Australian made with USA sourced materials extruded aluminum arms.
and components.
EASY FIT DESIGNS Designed by Yella Terra ANATOMY 1
and imitated by manufacturers worldwide, these
ingenious shaft and pedestal designs can be 2 9
fitted in around 1 hour with no head removal or
machining required. The EASY FIT rockers offer
superior rigidity to stud type rockers thereby
eliminating the need for expensive guide plates,
hardened pushrods and stud girdles.
COMPONENT STRENGTH Yella Terra aircraft 3 5 68
quality extruded arms are matched to massive 4 7
ground trunnions for superior durability to other
brands. Oversize needle roller bearings are used 1. Adjusting screw and lock nut
for better load distribution and other hardware 2. Unique roller slot for adequate lubrication,
used feature materials and finish that ensure
reliability, minimum friction and long life. specially machined to reduce stress
MORE POWER & BETTER PERFORMANCE concentrations
Aftermarket rockers provide significant power 3. Roller of generous diameter from chrome
increases. Higher ratio rockers lift the valve off
the seat at a much faster rate than stock rockers to moly steel hardened and ground
initiate and sustain increased airflow. Rather than 4. Roller pin positively retained by internal
hurting torque, lowering vacuum, and reducing idle
quality, higher ratio rockers improve horsepower circlip
and torque. On average increases of 14HP and 5. Lightweight rocker with excellent balance and
12ft lbs torque are seen with factory ratio rocker
replacement and 25HP and 20ft lbs with higher low inertia
ratio rockers. 6. Torrington needle roller bearings full
WORLD’S LARGEST RANGE Yella Terra complement design, not cheap turned steel.
offers the largest range of rocker types and ratio 7. Clearance for large springs and large fillet
combinations to suit more engine and cylinder
head types and performance designs radius rocker studs
8. Huge high strength trunnion or shaft,
SPARE PARTS SUPPORT Proudly Australian
made, Yella Terra rockers are supported by a full precision ground from chrome moly steel to
range of single units and spare parts to ensure your bearing manufacturer’s specification
purchase will give service long into the future. 9. Pushrod socket (not visible) provides metered
oil supply and directs oil to trunnion and
roller slot.
YELLA TERRA | 9
AMC V8
FACTORY HEAD
• 304, 360, 390, 401
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2010 1.65 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 REQUIRES
YT 5010 1.65 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 REQUIRES
REQUIRES
HERMAN LEWIS REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6395 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3
YT 6396 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3 REQUIRES
EDELBROCK
• AMC 343-401 V8 Performer RPM for NHRA stock /super stock
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2009 1.65 HYD 3/8” STUD MOUNT POLYLOCK EF, 5
BMC INLINE 4
FACTORY HEAD
• “A” SERIES: 850cc, 1275cc
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6347 1.5 ADJ EF, 12
3/8” & 5/16” MODULAR SHAFT PUSHROD SCREW
• “B” SERIES: 1500cc, 1800cc
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6302 1.5 ADJ 5/16” EF, 12
YT 6644 1.6 ADJ 5/16” MODULAR SHAFT PUSHROD SCREW EF, 12
MODULAR SHAFT PUSHROD SCREW
BUICK/ROVER V8
FACTORY HEAD
• (BOP) BUICK, OLDSMOBILE, PONTIAC: 215 - Small Block Engines (1961-1963)
• ROVER/RANGE ROVER: 3.5 & 4.2 (3500cc - 4275cc)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6000 1.6 ADJ EF, 13
YT 6305 1.6 ADJ ORIGINAL SHAFT PUSHROD SCREW EF, 12
MODULAR SHAFT PUSHROD SCREW
CADILLAC V8 BIG BLOCK
FACTORY HEAD
• 472, 500 RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
1.75 7/16”
PART NO. MODULAR SHAFT PUSHROD SCREW EF, 12
YT 6687
10 | YELLA TERRA
BUICK, HOLDEN V6 BRAND APPLICATION MAX OPEN SPRING PRESS.
STREET TERRA
FACTORY HEAD ULTRALITE FACTORY REPLACEMENT/STREET <450lbs
• BUICK SERIES 1: 3800 231ci (to engine no. 1274842) (VN Series 1) PRO STREET
PLATINUM FACTORY REPLACEMENT/STREET <400lbs
STREET / STRIP <600lbs
RACE / STRIP <900lbs
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6656 EF
YT 6657 1.7 HYD 3/8” PEDESTAL MOUNT HYDRAULIC EF
1.8 HYD 3/8” PEDESTAL MOUNT HYDRAULIC
• BUICK SERIES 1: 3800 231ci (From engine no. 1274843) (VN Series 2, VP, VR, VS Series 1)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6658 1.7 HYD 5/16” EF
YT 6659 1.8 HYD 5/16” PEDESTAL MOUNT HYDRAULIC EF
PEDESTAL MOUNT HYDRAULIC
• BUICK SERIES 2 : L32, L36, L67 (Supercharged and N/A engines) (VS Series 2, VT, VX, VY)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6669 EF, 14
YT 6649 1.6 HYD 5/16” PEDESTAL MOUNT HYDRAULIC EF, 14
YT 6650 1.7 HYD 5/16” PEDESTAL MOUNT HYDRAULIC EF, 14
YT 6661 1.8 HYD 5/16” PEDESTAL MOUNT HYDRAULIC EF, 14
YT 6651 1.84 HYD 5/16” PEDESTAL MOUNT HYDRAULIC EF, 14
YT 6662 1.9 HYD 5/16” PEDESTAL MOUNT HYDRAULIC EF, 14
YT 6666 1.95 HYD 5/16” PEDESTAL MOUNT HYDRAULIC EF, 14
YT 6361 1.95/1.9 HYD 5/16” PEDESTAL MOUNT HYDRAULIC 3
YT 6307 3
YT 6333 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 3
1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW
1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW
CHEV V8 SMALL BLOCK LT1 CENTER BOLT
FACTORY HEAD
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6672 1.5 EF, 5, 21
YT 6608 1.6 3/8” STUD MOUNT EF, 5, 21
3/8” STUD MOUNT
AFTERMARKET HEADS with factory valvetrain geometry
• DART: Pro1 LT1 • LINGENFELTER (LPE): LT1 • EDELBROCK: LT1
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6672 1.5 3/8” STUD MOUNT EF, 5, 21
YT 6608 1.6 3/8” STUD MOUNT EF, 5, 21
AIR FLOW RESEARCH
• LT Eliminator 227 (1.770 stud centers 60/40 valve spacing)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 5001 STUD MOUNT POLYLOCK 2, 3, 5
YT 5002 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6703 1.6 HYD 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6704 SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6705 1.5x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6706 1.6x1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
1.65x1.55 ADJ 7/16”
1.6x1.5 ADJ 7/16”
• LT Eliminator 180, 195, 210, 220 (1.810” stud centers)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 5001 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5002 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6688 1.5 ADJ 7/16” SHAFT MOUNT HYDRAULIC 2, 3, 6
YT 6689 1.6 ADJ 7/16” SHAFT MOUNT HYDRAULIC 2, 3, 6
YT 6694 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6695 1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6696 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YELLA TERRA | 11
CHEV V8 SMALL BLOCK
FACTORY HEAD
• SMALL BLOCK: 265, 267, 283, 302, 305, 307, 327, 350, 400 (1.770 stud centers)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2000 1.5 HYD 3/8” STUD MOUNT POLYLOCK EF, 5 .150” offset inlet (wide port)
ST 2004 1.6 HYD 3/8” STUD MOUNT POLYLOCK EF, 5
ST 2001 1.5 HYD 7/16“ STUD MOUNT POLYLOCK 2, 3, 5
ST 2005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5000 1.5 HYD 3/8” STUD MOUNT POLYLOCK EF, 5
YT 5019 1.6 HYD 3/8” STUD MOUNT POLYLOCK EF, 5
YT 5023 1.5x1.6 HYD 3/8” STUD MOUNT POLYLOCK EF, 5
YT 5001 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5002 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6301 1.65 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6008 1.55x1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6009 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6341 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6613 1.65x1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6355 1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6356 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6357 1.65x1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
AFTERMARKET HEADS with factory valvetrain geometry
• ALLPRO: 215 23° • BRODIX: Track 1 • EDELBROCK: Victor Jnr. (1.770 stud centers)
• BOWTIE: Iron & Alloy 23° • DART: II, Iron Eagle 23° • PRO TOPLINE (RHS) • WORLD: Sportsman II, Conquest, S/R Torquer 305
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2000 1.5 HYD 3/8” STUD MOUNT POLYLOCK EF, 5 .150” offset inlet (wide port)
ST 2004 1.6 HYD 3/8” STUD MOUNT POLYLOCK EF, 5
ST 2001 1.5 HYD 7/16“ STUD MOUNT POLYLOCK 2, 3, 5
ST 2005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5000 1.5 HYD 3/8” STUD MOUNT POLYLOCK EF, 5
YT 5019 1.6 HYD 3/8” STUD MOUNT POLYLOCK EF, 5
YT 5023 1.5x1.6 HYD 3/8” STUD MOUNT POLYLOCK EF, 5
YT 5001 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5002 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6301 1.65 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6008 1.55x1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6009 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6341 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6613 1.65x1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6355 1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6356 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6357 1.65x1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
AIR FLOW RESEARCH
• 180, 195, 210 23° Original (Pre Eliminator) (1.770” stud centers)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6618 SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .274” offset inlet
YT 6619 1.55x1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .274” offset inlet
1.65x1.55 ADJ 7/16”
• 220, 225 Original (Pre Eliminator) (1.770” stud centers)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6326 1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .265” offset inlet
YT 6327 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .265” offset inlet
YT 6343 1.65x1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .265” offset inlet
• 227 23° Original (Pre Eliminator) (1.770” stud centers)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 5001 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 .206” offset inlet
YT 5002 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 .206” offset inlet
YT 6615 1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .206” offset inlet
YT 6616 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6617 1.65x1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
12 | YELLA TERRA
BRAND APPLICATION MAX OPEN SPRING PRESS.
STREET TERRA
PRO STREET FACTORY REPLACEMENT/STREET <450lbs
PLATINUM
STREET / STRIP <600lbs
• Eliminator 180, 195, 210, 220 (1.810” stud centers) RACE / STRIP <900lbs
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 5001 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5002 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6688 1.5 ADJ 7/16” SHAFT MOUNT HYDRAULIC 2, 3, 6
YT 6689 1.6 ADJ 7/16” SHAFT MOUNT HYDRAULIC 2, 3, 6
YT 6694 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6695 1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6696 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
• Eliminator 227, 235 (1.770 stud centers 60/40 valve spacing)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 5001 STUD MOUNT POLYLOCK 2, 3, 5
YT 5002 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6703 1.6 HYD 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6704 SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6705 1.5x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6706 1.6x1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
1.65x1.55 ADJ 7/16”
1.6x1.5 ADJ 7/16”
BOWTIE
• Alloy 23° (1.810” stud centers)
REQUIRES (1.810” stud centers)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6308 1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6325 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6338 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
• 23° SBC 10051101
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6694 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6695 1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6696 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
BRODIX
• -8, -10x, -11 (1.810” stud centers)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6308 1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 REQUIRES
YT 6325 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6338 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
• 18X RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
1.5x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
PART NO. 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6315
YT 6316
BROWNFIELD & CANFIELD
• BROWNFIELD: 195 (1.770 stud centers)
• CANFIELD: Avenger
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6326 1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .265” offset inlet
YT 6327 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .265” offset inlet
YT 6343 1.65x1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .265” offset inlet
DART RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
SHAFT MOUNT .276” offset inlet
• 220 23° 1.6x1.5 ADJ 7/16” PUSHROD SCREW 2, 3, 6
PART NO.
YT 6622
YELLA TERRA | 13
CHEV V8 SMALL BLOCK (CONTINUED)
DART
• PRO 1 23° (1.770” stud centers)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 5001 STUD MOUNT POLYLOCK 2, 3, 5
YT 5002 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6035 1.6 HYD 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6620 1.55x1.66 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .158” offset inlet
YT 6621 SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .158” offset inlet
YT 6623 1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .158” offset inlet
1.6x1.5 ADJ 7/16” .158” offset inlet
1.6 ADJ 7/16”
PONTIAC MOTORSPORTS
• 10045434 & 10033867 (semi finished pushrod holes suit offset rocker arms) (1.810” stud centers)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6342 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .276” offset inlet
YT 6340 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .276” offset inlet
• 867 NASCAR 23° (1.810” stud centers)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6308 1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6325 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6338 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
PROFILER
• All American 23° 176 (1.810” stud centers)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6342 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .276” offset inlet
YT 6340 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .276” offset inlet
RACER PRO
• RP216 (standard port) (1.810” stud centers)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6308 1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6325 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6338 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
• RP216RI (raised inlet, no pushrod slots suit offset rocker arms) (1.810” stud centers)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6342 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .276” offset inlet
YT 6340 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .276” offset inlet
• RP23° CNC (1.810” stud centers)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6757 1.6 ADJ 7/16” SHAFT MOUNT
PUSHROD SCREW 2, 3, 6
TRICKFLOW
• Twisted Wedge
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6355 1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6356 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6357 1.5x1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
WORLD PRODUCTS
• Motown, Hardcore (1.770 stud centers)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .265” offset inlet
YT 6326 1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .265” offset inlet
YT 6327 1.6x1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 .265” offset inlet
1Y4T 6|34Y3ELLA TE1R.6R5xA1.55 ADJ
CHEV V8 LS1, LS2 BRAND APPLICATION MAX OPEN SPRING PRESS.
ULTRALITE
ALSO SUIT CHEV V8 : ULTRALITE PRO FACTORY REPLACEMENT/STREET <400lbs
• LS4 • LS6 • LM7 • LQ4 • LQ9 • LMG • L99 • LR4 • LY5 PRO STREET
PLATINUM FACTORY REPLACEMENT/STREET <480lbs
STREET / STRIP <600lbs
RACE / STRIP <900lbs
FACTORY HEAD
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6645 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6646 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6647 1.8x1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6721 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6722 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6723 1.7x1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6721-M10 1.7 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6722-M10 1.8 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6723-M10 1.7x1.8 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6683 1.7 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6684 1.8 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6683-M10 1.7 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6684-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6640 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6648 1.8 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6640-M10 1.7 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6648-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
AFTERMARKET HEADS with factory valvetrain geometry
• AFR • TFS: 215 • WORLD PRODUCTS
• DART: 205, 255 • EDELBROCK
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6645 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6646 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6647 1.8x1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6721 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6722 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6723 1.7x1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6721-M10 1.7 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6722-M10 1.8 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6723-M10 1.7x1.8 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6683 1.7 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6684 1.8 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6683-M10 1.7 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6684-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6640 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6648 1.8 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6640-M10 1.7 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6648-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
TRICKFLOW
• Gen X 215cc, 225cc, 235cc
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6731 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6732 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6727 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6728 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6727-M10 1.7 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 7
YT 6728-M10 1.8 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 7
YT 6735 1.7 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6736 1.8 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6739-M10 1.7 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6740-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YELLA TERRA | 15
CHEV V8 LS1, LS2 SERIES (CONTINUED)
MAST
• 510-223/323
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6675 1.7 ADJ 8.0mm SHAFT MOUNT REQUIRES
PUSHROD SCREW EF, 6, 7
• 510-220/320, 510-221/321
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6677 1.7 ADJ 8.0mm SHAFT MOUNT
PUSHROD SCREW EF, 6, 7
CHEV V8 LS3, LS9, LSA, L98 SERIES
ALSO SUIT CHEVROLET/GMC LS SERIE TRUCKS: L76, L77, LY6, L92, L94, L96, LC8, LC9, LH9, LMF, LH9
FACTORY HEAD
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6667 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6668 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6685 1.85 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6724 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6725 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6726 1.85 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6724-M10 1.7 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6725-M10 1.8 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6726-M10 1.85 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6653 1.7 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6654 1.8 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6655 1.8x1.7 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6653-M10 1.7 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6654-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6682 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6, 8
YT 6686 1.8 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6, 8
YT 6682-M10 1.7 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6686-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
AFTERMARKET HEADS with factory valvetrain geometry
• GMPP CNC: 5364 Casting • SDPC CNC LS3/L92: 0821 Casting
• LPE CNC: 823 Casting • TEA CNC LS3/L92: 823 Casting
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6667 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6668 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6685 1.85 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6724 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6725 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6726 1.85 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 7
YT 6724-M10 1.7 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6725-M10 1.8 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6726-M10 1.85 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6653 1.7 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6654 1.8 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6655 1.8x1.7 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6653-M10 1.7 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6654-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6682 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6, 8
YT 6686 1.8 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6, 8
YT 6682-M10 1.7 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6686-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
16 | YELLA TERRA
BRAND APPLICATION MAX OPEN SPRING PRESS.
ULTRALITE
ULTRALITE PRO FACTORY REPLACEMENT/STREET <400lbs
PRO STREET
PLATINUM FACTORY REPLACEMENT/STREET <480lbs
GM PERFORMANCE STREET / STRIP <600lbs
• No. 19201805 RACE / STRIP <900lbs
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6752 1.7 8.0mm SHAFT TYPE HYDRAULIC EF, 6, 22
YT 6753 1.8 8.0mm SHAFT TYPE HYDRAULIC EF, 6, 22
MAST
• 510-301 (3.890”+ Bore) 240cc
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6679 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6747 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 8
YT 6749 1.8 ADJ 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 8
• 510-303 (4.000”+ Bore) 255cc
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6680 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6748 1.7 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6681 1.8 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
• 510-304 (4.125”+ Bore) 280cc
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6676 1.8 ADJ 8.0mm SHAFT MOUNT
PUSHROD SCREW EF, 6, 8
TRICKFLOW
• Gen X 255cc RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
PART NO. 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6733 1.7 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6734 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22
YT 6729 1.7 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6730 1.8 HYD 10.0mm SHAFT MOUNT HYDRAULIC 2, 4, 6, 7
YT 6729-M10 1.7 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6730-M10 1.8 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8
YT 6737 1.7 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6738 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6741-M10
YT 6742-M10
CHEV V8 LS7, LSX SERIES
FACTORY HEAD
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6670 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22, 26
YT 6670A 1.8 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22, 26
YT 6690 1.9 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22, 26
YT 6690A 1.9 HYD 8.0mm SHAFT MOUNT HYDRAULIC EF, 6, 22, 26
YT 6699A 1.8 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8, 26
YT 6691B 1.8 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8, 27
YT 6717A 1.9 ADJ 8.0mm STUD MOUNT PUSHROD SCREW EF, 5, 8, 15, 26
YT 6691-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6693-M10 1.9 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6691-JS 1.8 ADJ SHAFT MOUNT PUSHROD SCREW 25
YT 6697 1.8 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6, 8
YT 6698 1.9 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6, 8
YT 6718-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6697-M10 1.8 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YT 6698-M10 1.9 ADJ 10.0mm SHAFT MOUNT PUSHROD SCREW 2, 4, 6, 8
YELLA TERRA | 17
CHEVROLET V8 LS7, LSX SERIES (CONTINUED)
MAMO MOTORSPORTS
• MMS-LS7 RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
1.8 HYD 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 7
PART NO. 1.8 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8, 27 REQUIRES
YT 6754 REQUIRES
YT 6750 REQUIRES
MAST
• 510-306 (4.000”+ Bore) 265cc
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6673 1.8 ADJ 8.0mm SHAFT MOUNT
PUSHROD SCREW EF, 6, 8
• 510-307/309 (4.125”+ Bore) 285, 305cc
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6676 1.8 ADJ 8.0mm SHAFT MOUNT
PUSHROD SCREW EF, 6, 8
TRICKFLOW RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
1.8 HYD 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 7
• Gen X 260cc 1.8 ADJ 8.0mm SHAFT MOUNT PUSHROD SCREW EF, 6, 8, 27
PART NO.
YT 6754
YT 6750
CHEVROLET V6
FACTORY HEAD
L35: 4.3L (1992-1995)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6678 1.6 EF, 5, 21
3/8” STUD MOUNT
CHEVROLET V8 BIG BLOCK
FACTORY HEAD
FACTORY IRON: 396, 402, 427, 454 (all with standard length inlet valves)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2003 1.7 HYD 7/16” STUD MOUNT POLYLOCK EF, 5 (all with standard length inlet valves)
YT 5003 1.7 HYD 7/16” STUD MOUNT POLYLOCK EF, 5 REQUIRES
YT 5013 1.8 HYD 7/16” STUD MOUNT POLYLOCK EF, 5
YT 6317 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
YT 6318 1.75 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
YT 6319 1.8 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
FACTORY HEADS with factory valvetrain geometry
• BRODIX: -1, -2
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2003 1.7 HYD 7/16” STUD MOUNT POLYLOCK EF, 5
YT 5003 1.7 HYD 7/16” STUD MOUNT POLYLOCK EF, 5
YT 5013 1.8 HYD 7/16” STUD MOUNT POLYLOCK EF, 5
YT 6317 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
YT 6318 1.75 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
YT 6319 1.8 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
18 | YELLA TERRA
BRAND APPLICATION MAX OPEN SPRING PRESS.
STREET TERRA
ULTRALITE PRO FACTORY REPLACEMENT/STREET <450lbs
PRO STREET
PLATINUM FACTORY REPLACEMENT/STREET <480lbs
BRODIX STREET / STRIP <600lbs
• BRODIX: 2x, 3, 4
(all with +150” or longer inlet valves) RACE / STRIP <900lbs
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2003 STUD MOUNT POLYLOCK EF, 5
YT 5003 1.7 HYD 7/16” STUD MOUNT POLYLOCK EF, 5
YT 5013 STUD MOUNT POLYLOCK EF, 5
YT 6603 1.7 HYD 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
YT 6604 1.8 HYD 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
1.7 ADJ 7/16”
1.75x1.7 ADJ 7/16”
CHEV PERFORMANCE
• CHEV PERFORMANCE: Bowtie (all with +150” or longer inlet valves)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2003 STUD MOUNT POLYLOCK EF, 5
YT 5003 1.7 HYD 7/16” STUD MOUNT POLYLOCK EF, 5
YT 5013 STUD MOUNT POLYLOCK EF, 5
YT 6603 1.7 HYD 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
YT 6604 1.8 HYD 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
1.7 ADJ 7/16”
1.75x1.7 ADJ 7/16”
DART
• Iron Eagle (all with +150” or longer inlet valves)
• Pro 1 REQUIRES
• Big M 410 FOOTNOTE
EF, 5
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER EF, 5
ST 2003 STUD MOUNT POLYLOCK EF, 5
YT 5003 1.7 HYD 7/16” STUD MOUNT POLYLOCK EF, 6, 16
YT 5013 STUD MOUNT POLYLOCK EF, 6, 16
YT 6603 1.7 HYD 7/16” SHAFT MOUNT PUSHROD SCREW
YT 6604 1.8 HYD 7/16” SHAFT MOUNT PUSHROD SCREW
1.7 ADJ 7/16”
1.75x1.7 ADJ 7/16”
EDELBROCK
• Victor Jnr. (all with +150” or longer inlet valves)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2003 STUD MOUNT POLYLOCK EF, 5
YT 5003 1.7 HYD 7/16” STUD MOUNT POLYLOCK EF, 5
YT 5013 STUD MOUNT POLYLOCK EF, 5
YT 6603 1.7 HYD 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
YT 6604 1.8 HYD 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
1.7 ADJ 7/16”
1.75x1.7 ADJ 7/16”
WORLD PRODUCTS
• Merlin (all with +150” or longer inlet valves)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2003 STUD MOUNT POLYLOCK EF, 5
YT 5003 1.7 HYD 7/16” STUD MOUNT POLYLOCK EF, 5
YT 5013 STUD MOUNT POLYLOCK EF, 5
YT 6603 1.7 HYD 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
YT 6604 1.8 HYD 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 16
1.7 ADJ 7/16”
1.75x1.7 ADJ 7/16”
YELLA TERRA | 19
CHRYSLER INLINE 6
FACTORY HEAD
• HEMI: 215, 245, 265
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2036 1.7 HYD 3/8” STUD MOUNT POLYLOCK EF, 5, 15 REQUIRES
ST 2036A 1.7 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5, 15 REQUIRES
YT 5036 1.7 HYD 3/8” STUD MOUNT POLYLOCK EF, 5, 15
YT 5037 1.73 HYD 3/8” STUD MOUNT POLYLOCK EF, 5, 15 REQUIRES
YT 5036A 1.7 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5, 15 REQUIRES
YT 5037A 1.73 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5, 15 REQUIRES
REQUIRES
• SLANT 6: 170, 198, 225
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6711
MODULAR SHAFT PUSHROD SCREW 12
CYLINDER HEAD INNOVATIONS (CHI)
• HEMI: 215, 245, 265
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 5036CHI 1.7 7/16” STUD MOUNT POLYLOCK EF, 5, 15
YT 5037CHI 1.73 7/16” STUD MOUNT POLYLOCK EF, 5, 15
CHRYSLER V8 MOPAR
FACTORY HEAD
• SMALL BLOCK LA ENGINE: 273, 318, 340, 360
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6011 1.5 ADJ 13
YT 6001 1.5 ADJ ORIGINAL SHAFT PUSHROD SCREW 12
YT 6300 1.65 ADJ MODULAR SHAFT PUSHROD SCREW 12
MODULAR SHAFT PUSHROD SCREW
• BIG BLOCK R & RB ENGINE: 361, 383, 440
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6012 12
YT 6013 1.5 ADJ MODULAR SHAFT PUSHROD SCREW 13
1.5 ADJ ORIGINAL SHAFT PUSHROD SCREW
EDELBROCK
• Performer RPM Magnum 61769, 61775, 61779
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6712 1.65 ADJ 7/16” SHAFT MOUNT
PUSHROD SCREW 2, 3, 6
FORD INLINE 6
FACTORY HEAD
• FALCON 6 (PRE CROSSFLOW): 144, 170, 200, 250
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2014 1.65 HYD 5/16” SHAFT MOUNT EF, 17
YT 6014 1.65 ADJ 5/16” SHAFT MOUNT EF, 17
20 | YELLA TERRA
BRAND APPLICATION MAX OPEN SPRING PRESS.
STREET TERRA
PRO STREET FACTORY REPLACEMENT/STREET <450lbs
PLATINUM
STREET / STRIP <600lbs
FACTORY HEAD RACE / STRIP <900lbs
• AUSTRALIAN CROSSFLOW IRON & ALLOY: 200, 250
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2034 1.72 HYD 5/16” PEDESTAL MOUNT EF, 5 +.080” SUIT HIGHER VALVES
ST 2018 1.72 ADJ 5/16” PEDESTAL MOUNT EF, 5
YT 6018 1.73 ADJ 5/16” PEDESTAL MOUNT EF, 5
YT 5011 1.73 HYD 7/16” STUD MOUNT 2, 3, 5
YT 6345 1.73 ADJ 7/16” PEDESTAL MOUNT 2, 3
YT 6345A 1.73 ADJ 7/16” PEDESTAL MOUNT 2, 3
FORD ESSEX V6
FACTORY HEAD
• 2.5L, 3.0L, 3.4L
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2007 1.5 HYD 3/8” STUD MOUNT POLYLOCK 20
YT 5016 1.55 HYD 3/8” STUD MOUNT POLYLOCK 20
YT 6344 1.6 ADJ 7/16” PEDESTAL MOUNT PUSHROD SCREW 2, 3
FORD V8 CLEVELAND & BIG BLOCK
FACTORY HEAD
• CLEVELAND: 302 Oval Combustion Chamber • CLEVELAND: 400
• CLEVELAND: 351 Round Combustion Chamber • BIG BLOCK: 429, 460
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2035 1.72 HYD 5/16” PEDESTAL MOUNT HYDRAULIC EF, 5
ST 2015 1.72 ADJ 5/16” PEDESTAL MOUNT PUSHROD SCREW EF, 5 ALL INC. DRILL ALIGN TOOL & PIN
ST 2003 1.72 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 SUIT +.150”TALLER VALVE
YT 6015 1.73 ADJ 5/16” PEDESTAL MOUNT PUSHROD SCREW EF, 5 SUIT +.150”TALLER VALVE
YT 5006 1.73 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6321 1.73 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 16
YT 6321A 1.73 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 16
YT 6322 1. 8 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 16
YT 6322A 1.8 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 16
FACTORY HEADS with factory valvetrain geometry
• AFD: 2V & 4V • C.H.I: 3V Alloy • EDELBROCK: Performer RPM 460, 351C & Clevor
• A-460 • PRO-FILER PERFORMANCE: BBF • TRICKFLOW: Powerport
• FORD RACING • BRODIX: BBF
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2003 1.72 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5006 1.73 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 SUIT +.150” HIGHER VALVE
YT 6321 1.73 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 16 SUIT +.150” HIGHER VALVE
YT 6321A 1.73 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 16
YT 6322 1.8 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 16
YT 6322A 1.8 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 16
YELLA TERRA | 21
FORD V8 WINDSOR
FACTORY HEAD
• 221, 255, 260, 289, 302 - Carb engines (3/8” stud type head slotted pushrod holes)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2004 1.6 HYD 3/8” STUD MOUNT POLYLOCK EF, 5 STUD BOSSES MACHINED
ST 2005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 STUD BOSSES MACHINED
YT 5004 1.6 HYD 3/8” STUD MOUNT POLYLOCK EF, 5 STUD BOSSES MACHINED
YT 5005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 STUD BOSSES MACHINED
YT 5026 1.7 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 STUD BOSSES MACHINED
YT 6314 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 STUD BOSSES MACHINED
• 302, 351: Carb engines (3/8” stud type head round pushrod holes)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2044 1.6 HYD 3/8” SHAFT MOUNT HYDRAULIC EF, 5 SUITS FACTORY 3/8” STUDS
YT 5004 1.6 HYD 3/8” STUD MOUNT POLYLOCK EF, 5 STUD BOSSES MACHINED
YT 5005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 STUD BOSSES MACHINED
YT 5026 1.7 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 STUD BOSSES MACHINED
YT 6314 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 STUD BOSSES MACHINED
• 302, 351: Carb engines (3/8” x 5/16” stepped studs)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2045 1.6 HYD HYDRAULIC EF, 6 STUD BOSSES MACHINED
YT 5004 1.6 HYD 3/8”x5/16 SHAFT MOUNT POLYLOCK STUD BOSSES MACHINED
YT 5005 1.6 HYD POLYLOCK 2, 3, 5 STUD BOSSES MACHINED
YT 5026 1.7 HYD 3/8” STUD MOUNT POLYLOCK 2, 3, 5 STUD BOSSES MACHINED
YT 6314 1.65 ADJ 7/16” STUD MOUNT PUSHROD SCREW 2, 3, 6
7/16” STUD MOUNT
7/16” SHAFT MOUNT
• 5.0L - 5.8L: Factory iron EFI - 1981 onwards (Non stud type heads)
• GT-40P/ FORD SVO
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2046 1.6 HYD 5/16” SHAFT MOUNT HYDRAULIC EF, 6 REPLACES ST 2027
ST 2047 1.6 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6
ST 2028 1.72 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 6027 1.72 HYD 5/16” SHAFT MOUNT HYDRAULIC EF, 6
YT 5004 1.6 HYD 3/8” STUD MOUNT POLYLOCK
YT 5005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5026 1.7 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6314 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
FACTORY HEADS with factory valvetrain geometry
• AFR: Alloy Renegades 302-351
• EDELBROCK: Performer 6027 - 6031
• EDELBROCK: Performer RPM 6021 - 6026
• EDELBROCK: Victor Jnr. 7716-7719
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2004 1.6 HYD 3/8” STUD MOUNT POLYLOCK
ST 2005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5004 1.6 HYD 3/8” STUD MOUNT POLYLOCK 2, 3, 5
YT 5005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5026 1.7 HYD 7/16“ STUD MOUNT POLYLOCK 2, 3, 6
YT 6610 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6611 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6612 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6629 1.7x1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW
YATES
• FORD WINDSOR
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6323 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 5021 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6324 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
22 | YELLA TERRA
BRAND APPLICATION MAX OPEN SPRING PRESS.
STREET TERRA
ULTRALITE FACTORY REPLACEMENT/STREET <450lbs
PRO STREET
PLATINUM FACTORY REPLACEMENT/STREET <400lbs
DART STREET / STRIP <600lbs
• Windsor Jnr. (Iron & Alloy) RACE / STRIP <900lbs
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2004 1.6 HYD 3/8” STUD MOUNT POLYLOCK
ST 2005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5004 1.6 HYD 3/8” STUD MOUNT POLYLOCK
YT 5005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5026 1.7 HYD 7/16“ STUD MOUNT POLYLOCK 2, 3, 5
YT 6323 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 5021 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6324 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
FORD MOTORSPORT
• J302 K302 RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
1.6 HYD 3/8” STUD MOUNT POLYLOCK
PART NO. 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
ST 2004 1.6 HYD 3/8” STUD MOUNT POLYLOCK
ST 2005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 5004 1.7 HYD 7/16“ STUD MOUNT POLYLOCK 2, 3, 5
YT 5005 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 5026 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6323 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 5021
YT 6324
• N351 Iron RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
PART NO. 1.7x1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6606
YT 6607
FORD MOTORSPORT
• SBF: Pro Action
• SBF: Pro Elite
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6637 1.6 ADJ 7/16” SHAFT MOUNT
PUSHROD SCREW 2, 3, 6
SIZE
• ROUSH: 200 RATIO 3/8” MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
1.6 HYD 7/16” STUD MOUNT POLYLOCK 30mm PEDESTALS
PART NO. 1.6 HYD 3/8” STUD MOUNT POLYLOCK 2, 3, 5 30mm PEDESTALS
ST 2004 1.6 HYD 7/16” STUD MOUNT POLYLOCK 30mm PEDESTALS
ST 2005 1.6 HYD 7/16“ STUD MOUNT POLYLOCK 2, 3, 5 30mm PEDESTALS
YT 5004 1.7 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 30mm PEDESTALS
YT 5005 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 30mm PEDESTALS
YT 5026 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 30mm PEDESTALS
YT 6323 1.7 ADJ SHAFT MOUNT PUSHROD SCREW 2, 3, 6 30mm PEDESTALS
YT 5021
YT 6324
TRICKFLOW
•TRICKFLOW: 302-351
•TRICKFLOW & WILBURT: Street Heat
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 5027 1.6 ADJ 7/16”
SHAFT MOUNT PUSHROD SCREW 2, 3, 6
• TRICKFLOW: Twisted Wedge
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 5004 1.6 HYD 3/8” STUD MOUNT POLYLOCK
YT 5005 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 .274” offset inlet
YT 5026 1.7 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 5 .274” offset inlet
YT 6358 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6353 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6 YELLA TERRA | 23
HOLDEN INLINE 6
FACTORY HEAD
• GREY: 132.5, 138
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6743 (Factory 3/8” pressed in rocker studs)
YT 6743B 1.6 ADJ MODULAR SHAFT PUSHROD SCREW EF, 12, 24 REQUIRES
1.6 ADJ MODULAR SHAFT PUSHROD SCREW EF, 12, 23, 24
(Factory 5/16” screw in rocker studs)
• RED: 149, 161, 179, 186 REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE (Accept 7/16” rocker thread)
ST 2007 1.5 HYD 3/8” STUD MOUNT POLYLOCK EF, 9 REQUIRES
ST 2008 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 10
ST 2012 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 10 (Accept 7/16” rocker thread)
ST 2030A 1.5 HYD 5/16” SHAFT MOUNT HYDRAULIC 2, 3, 6, 19 REQUIRES
ST 2031A 1.5 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6, 19
YT 5007 1.5 HYD 3/8” STUD MOUNT POLYLOCK EF, 9
YT 5008 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 10
YT 5029 1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6312 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6332 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6371 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
• RED: 173, 202
• BLUE: 202 (3300cc)
• BLACK: 202 (3300cc)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2007 1.5 HYD 3/8” STUD MOUNT POLYLOCK 2, 3, 18, 10
ST 2008 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 10
ST 2012 1.6 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 10
ST 2030 1.5 HYD 5/16” SHAFT MOUNT HYDRAULIC EF, 6
ST 2031 1.5 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 5007 1.5 HYD 3/8” STUD MOUNT POLYLOCK 2, 3, 18, 10
YT 5008 1.5 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 10
YT 5029 1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6312 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6332 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6371 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YELLA TERRA
• 12 Port Alloy (ACH/A 33C72 & ACH/A 33C56)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2008 1.5 HYD 7/16” STUD MOUNT POLYLOCK EF, 10
ST 2012 1.6 HYD 7/16” STUD MOUNT POLYLOCK EF, 10
ST 2030A 1.5 HYD 5/16” SHAFT MOUNT HYDRAULIC EF, 6, 19
ST 2031A 1.5 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 19
YT 5008 1.5 HYD 7/16” STUD MOUNT POLYLOCK EF, 10
YT 5029 1.5 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 6312 1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 6332 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 6371 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6
J.ZED
• Duggan Alloy
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6630 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 6632 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 16
24 | YELLA TERRA
HOLDEN V8 BRAND APPLICATION MAX OPEN SPRING PRESS.
STREET TERRA
FACTORY HEAD PRO STREET FACTORY REPLACEMENT/STREET <450lbs
PLATINUM
STREET / STRIP <600lbs
RACE / STRIP <900lbs
• CARBURETTOR ENGINES: 253, 308, 304 (1969-1988) (Factory 5/16” screw in rocker studs)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2009 1.65 HYD 3/8” STUD MOUNT POLYLOCK 2, 3, 18, 11 SUIT +.150”TALLER VALVE
ST 2010 1.65 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 11
ST 2032 1.65 HYD 5/16” SHAFT MOUNT HYDRAULIC EF, 6
ST 2033 1.65 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6
ST 2043 1.72 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 5010 1.65 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 11
YT 5032 1.65 HYD 5/16” SHAFT MOUNT HYDRAULIC EF, 6
YT 5033 1.65 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 5020 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 5020A 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
• EFI ENGINES: 5.0L, 5.7L (1988-2000) (Factory 5/16” screw in rocker studs)
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
ST 2009 1.65 HYD 3/8” STUD MOUNT POLYLOCK 2, 3, 18, 11 INC. STANDARD 2” CAPSCREW (YT 6088)
ST 2010 1.65 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 11 INC. LONGER 2 1/4” CAPSCREW (YT 6098)
ST 2032 1.65 HYD 5/16” SHAFT MOUNT HYDRAULIC EF, 6 SUIT 3/8” P/RODS +.080” INLET OFFSET
ST 2033 1.65 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6 SUIT 3/8” P/RODS. INC. 2 1/4” CAPSCREW
ST 2043 1.72 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 5010 1.65 HYD 7/16” STUD MOUNT POLYLOCK 2, 3, 11
YT 6309 1.65 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 6030 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6030A 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6030B 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW 2, 3, 6
YT 6030C 1.65 ADJ 7/16” SHAFT MOUNT PUSHORD SCREW 2, 3, 6
YELLA TERRA
• Hi-Port Alloy (ABH/A 308-3) (Accept 7/16” rocker thread)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2010 1.65 HYD 7/16” STUD MOUNT POLYLOCK EF, 11 SUIT +.150”TALLER VALVE
ST 2032A 1.65 HYD 5/16” SHAFT MOUNT HYDRAULIC EF, 6, 19
ST 2033A 1.65 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 19
YT 5010 1.65 HYD 7/16” STUD MOUNT POLYLOCK EF, 11
YT 5032A 1.65 HYD 5/16” SHAFT MOUNT HYDRAULIC EF, 6, 19
YT 5033A 1.65 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 19
YT 5020 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 5020A 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6
• Alloy (ABH/A 5000-5) (Accept 7/16” rocker thread)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 5040 1.65 ADJ 7/16” SHAFT MOUNT
PUSHROD SCREW EF, 6
• Alloy (ABH/A 5000-9) (Accept 7/16” rocker thread)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6313 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6 INC. STANDARD 2” CAPSCREW (YT 6088)
YT 6313A 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6 INC. LONGER 2 1/4” CAPSCREW (YT 6098)
• Alloy (ABH/A 5000-11) (Accept 7/16” rocker thread)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6756 1.65 ADJ 7/16” SHAFT MOUNT
PUSHROD SCREW EF, 6
YELLA TERRA | 25
HOLDEN V8 (CONTINUED)
COME RACING
• 590 Alloy series VN (Accept 7/16” rocker thread)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
ST 2010 1.65 HYD 7/16” STUD MOUNT POLYLOCK EF, 11 INC. STANDARD 2” CAPSCREW (YT 6088)
ST 2032A 1.65 HYD 5/16” SHAFT MOUNT HYDRAULIC EF, 6, 19 INC. LONGER 2 1/4” CAPSCREW (YT 6098)
ST 2033A 1.65 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 19 SUIT 3/8” P/RODS +.080” INLET OFFSET
YT 5010 1.65 HYD 7/16” STUD MOUNT POLYLOCK EF, 11 SUIT 3/8” P/RODS. INC. 2 1/4” CAPSCREW
YT 6309A 1.65 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6, 19
YT 6030 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 6030A 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 6030B 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW EF, 6
YT 6030C 1.65 ADJ 7/16” SHAFT MOUNT PUSHORD SCREW EF, 6
HOLDEN INLINE 4
FACTORY HEAD
• STARFIRE RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
1.5 HYD 5/16” SHAFT MOUNT HYDRAULIC EF, 6
PART NO. 1.5 ADJ 5/16” SHAFT MOUNT PUSHROD SCREW EF, 6
ST 2052
ST 2053
HOLDEN V6
See Buick V6 3800 (page: 11)
JEEP
FACTORY HEAD
• INLINE 4: 2.5L (suit 1982-2002)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6626 1.6 HYD 5/16” SHAFT TYPE HYDRAULIC EF, 6 REQUIRES
REQUIRES
• INLINE 6: 4.0L - 4.2L
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6627 1.6 HYD 5/16” SHAFT TYPE HYDRAULIC EF, 6
YT 6628 1.7 HYD 5/16” SHAFT TYPE HYDRAULIC EF, 6
YT 6328 1.6 ADJ 5/16” SHAFT TYPE PUSHROD SCREW EF, 6
• V6: 3.3 EGA (suit WRANGLER 2007 - 2011)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6714 1.65 HYD 13
YT 6716 1.65 HYD ORIGINAL SHAFT HYDRAULIC 12
MODULAR SHAFT HYDRAULIC
NISSAN/DATSUN INLINE 4
FACTORY HEAD
• A10 • A12 • A12A • A13 • A14 • A15 • 1000 • 1200 • 1500
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6023 1.55 ADJ
MODULAR SHAFT PUSHROD SCREW 12
26 | YELLA TERRA
OLDSMOBILE V8 BRAND APPLICATION MAX OPEN SPRING PRESS.
STREET TERRA
PRO STREET FACTORY REPLACEMENT/STREET <450lbs
PLATINUM
STREET / STRIP <600lbs
FACTORY HEAD RACE / STRIP <900lbs
• 350-455 : Until 1980 (with 5/16” pushrod ball)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6671 1.6 ADJ 7/16” STUD MOUNT
PUSHROD SCREW 2, 3, 5
PONTIAC V8
FACTORY HEAD
• SUPER DUTY: 1961-1981 (fitted with rocker studs)
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 5010 1.65 7/16” STUD MOUNT POLYLOCK 2, 3, 5 +.240” INLET OFFSET
YT 6029 1.5 7/16” STUD MOUNT POLYLOCK 2, 3, 5 REQUIRES
YT 6372 1.65 7/16” SHAFT MOUNT PUSHROD SCREW NOTE 7/16”
YT 6370 1.55 7/16” SHAFT MOUNT PUSHROD SCREW NOTE 7/16” REQUIRES
MAY REQ. SLIGHT MACHINING OF
• 867 PONTIAC NASCAR 23° SHAFT FOR CLEARANCE
REQUIRES
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6308 SHAFT MOUNT PUSHROD SCREW NOTE 7/16” REQUIRES
YT 6325 1.55x1.55 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW NOTE 7/16” +.240” INLET OFFSET
YT 6338 1.6x1.6 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW NOTE 7/16” REQUIRES
1.6x1.5 ADJ 7/16”
• PONTIAC: CV-1
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6603 SHAFT MOUNT PUSHROD SCREW NOTE 7/16”
YT 6604 1.7 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW NOTE 7/16”
1.75x1.7 ADJ 7/16”
• PONTIAC: 6X Cast Iron
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6369 1.65 ADJ 7/16” SHAFT MOUNT
PUSHROD SCREW NOTE 7/16”
AFTERMARKET HEADS with factory valvetrain geometry
• EDELBROCK: Performer RPM 6056
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 5010 1.65 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6029 1.5 7/16” STUD MOUNT POLYLOCK 2, 3, 5
YT 6372 1.65 7/16” SHAFT MOUNT PUSHROD SCREW NOTE 7/16”
YT 6370 1.55 7/16” SHAFT MOUNT PUSHROD SCREW NOTE 7/16”
• KAUFFMAN RACING EQUIPMENT: D Port Aluminum
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE
YT 6369 1.65 ADJ 7/16” SHAFT MOUNT PUSHROD SCREW NOTE 7/16”
VOLVO INLINE 4
FACTORY HEAD
• B20: 1969-1981
PART NO. RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
YT 6674 1.65 ADJ 12
YT 6674A 1.65 ADJ MODULAR SHAFT PUSHROD SCREW 12, 23
MODULAR SHAFT PUSHROD SCREW
YELLA TERRA | 27
STUDEBAKER V8
FACTORY HEAD
• AVANTI 289 RATIO SIZE MOUNT TYPE ADJUSTER FOOTNOTE REQUIRES
1.75 ADJ 5/16”
PART NO. MODULAR SHAFT PUSHROD SCREW 12
YT 6744
NOTES
28 | YELLA TERRA
FOOTNOTES
EF. EASY FIT replaces original rockers. Rockers bolt on. Fits standard mountings. No
machining required.
2. Machine .300 - .320” from rocker pads.
3. Drill and tap 7/16” UNC.
4. Drill and tap 10mmx1.5.
5. Requires guide plates (sold separately) use original where applicable.
6. Shaft mount rockers do not require guide plates.
7. Requires YT 5132 - 10mm rubber spacer kit.
8. Requires YT 5123 - 25mm alloy spacer kit.
9. Requires YT 4986 - guide plates and hardened pushrods.
10. Requires YT 4987 - guide plates with brass bobbins.
11. Requires YT 3081 - guide plates.
12. Total system includes cradle, shafts and arms.
13. Bushed arms to suit standard shafts.
14. All Buick V6 rockers include +.240” larger pushrods YT 6574 and special aligning
plate YT 6561.
15. Studs included.
16. Drill head for pedestal aligning pin (drill align tool & pin supplied).
17. Requires YT 14101-12 - pushrod & lifter kit. Includes adaptor plates.
170ci/Narrow block may differ in pushrod length.
18. Requires YT 1853 - 3/8” x 7/16” (12 pack).
19. Includes 5/16” x 7/16” adaptors.
20. Drive studs .312” further into head, removal not required, rockers mount to studs.
21. Includes self aligning roller.
22. Includes YT 5132 - 10mm rubber spacer kit.
23. Special ball adjusters to suit factory style cup-end pushrods
24. Uses OEM style through shaft oiling
25. Rockers for LS7 heads with cast pedestals machined off to Jesel specs. Retains the
Jesel machined footprint of 3/8” and 7/16” UNF threads. Will require high rocker
cover spacers (YT 5123). May require shims to ensure flatness of shaft across pedestals.
26. “D” Saddles (included) must be used to ensure correct radial fitment of the rocker
shaft into the rocker cradle of the factory LS7 cylinder head. Some LS7 cylinder
heads have variations in Rocker post machining and may require some further relief
to clear the bottom of the Yella Terra Rocker. Special Instructions included.
27. Includes YT 5143 8.00mm x 8.00mm LS7 adaptors
YELLA TERRA | 29
MOUNTING HARDWARE & SPARES
PEDESTALS HEIGHT METRIC HEIGHT IMPERIAL 12 PACK 16 PACK
18.00mm 0.708” YT 18311 YT 18321
7/16” ID 20.00mm 0.785” YT 18312 YT 18322
23.00mm 0.905” YT 18313 YT 18323
PART NO. 25.00mm 0.985” YT 18314 YT 18324
YT 6093 27.50mm 1.083” YT 18315 YT 18325
YT 6594 28.70mm 1.130” YT 18316 YT 18326
YT 6180 30.00mm 1.180” YT 18317 YT 18327
YT 6087
YT 6217 HEIGHT METRIC HEIGHT IMPERIAL 12 PACK 16 PACK
YT 6160 18.50mm 0.725” YT 18300
YT 6595 20.00mm 0.787” YT 18301
22.20mm 0.874” YT 18303
5/16” & 8.0mm ID 25.00mm 0.985” YT 18305
PART NO.
YT 6600
YT 6512
YT 7005
YT 7011
SADDLES (a) (b) (c)
7/16” ID (a)
(height measured to bottom of saddle radius)
PART NO. HEIGHT METRIC HEIGHT IMPERIAL 12 PACK 16 PACK
YT 6235 17.00mm 0.670” YT 18340
YT 6269 19.00mm 0.748” YT 18341
YT 6230 22.50mm 0.885” YT 18342
YT 6586 24.60mm 0.970” YT 18343
YT 6263 28.60mm 1.125” YT 18344
16 PACK
3/8” ID (b) HEIGHT METRIC HEIGHT IMPERIAL 12 PACK
(c) 13.60mm 0.535” 16 PACK
PART NO. 13.60mm 0.535”
YT 6572
YT 7002 HEIGHT METRIC HEIGHT IMPERIAL 12 PACK
11.40mm 0.449”
5/16” ID 12.40mm 0.488”
12.40mm 0.488”
PART NO. 13.60mm 0.535”
YT 6559 13.60mm 0.535”
YT 6575 14.10mm 0.555”
YT 7003
YT 6571
YT 7001
YT 5044
SPACERS HEIGHT METRIC HEIGHT IMPERIAL 12 PACK 16 PACK
9.75mm 0.383” YT 18371
5/16” ID 12.60mm 0.495” YT 18373
15.00mm 0.590” YT 18375
PART NO. 19.60mm 0.770” YT 18377
YT 6550 21.00mm 0.826” YT 18379
YT 6227
YT 5049
YT 6592
YT 6591
30 | YELLA TERRA
ADJUSTMENT SHIM KITS
7/16” ID (a) (a) (b)
PART NO. HEIGHT METRIC HEIGHT IMPERIAL 4 PACK 12 PACK 16 PACK
YT 6579 0.635mm .025” YT 18700 YT 18710
YT 6279 1.016mm .040” YT 18701 YT 18711
YT 6279A 1.524mm .060” YT 18702 YT 18712
YT 6279B 2.032mm .080” YT 18703 YT 18713
YT 6580 2.540mm .100” YT 18704 YT 18714
YT 6580A 3.048mm .120” YT 18705 YT 18715
YT 6581 3.810mm .150” YT 18706 YT 18716
YT 6582 5.080mm .200” YT 18707 YT 18717
YT 6582A 6.096mm .240” YT 18708 YT 18718
12 PACK 16 PACK
8.00mm & 5/16” ID (a) YT 18725
12 PACK YT 18721
PART NO. HEIGHT METRIC HEIGHT IMPERIAL 4 PACK YT 18112
YT 6578 0.508mm .020” YT 18114 16 PACK
YT 5041 1.194mm .047” YT 18116 YT 18122
12 PACK YT 18124
PEANUT SHAPE (b) HEIGHT IMPERIAL YT 18109 YT 18126
.025” 12 PACK 16 PACK
PART NO. HEIGHT METRIC .050” 16 PACK
YT 6239X 0.635mm .100” 12 PACK YT 18101
YT 6240X 1.270mm YT 18102
YT 6241X 2.540mm 12 PACK 16 PACK
CAPSCREWS 16 PACK
7/16” (length measured under head)
PART NO. LENGTH METRIC LENGTH IMPERIAL 4 PACK
YT 6088 50.80mm 2”
YT 6098 57.15mm 21/4”
YT 6588 63.50mm 2 1/2”
3/8” LENGTH METRIC LENGTH IMPERIAL 4 PACK
44.45mm 1 3/4”
PART NO.
YT 6567
5/16” LENGTH METRIC LENGTH IMPERIAL 4 PACK
25.40mm 1” YT 18055
PART NO. 38.10mm 1 1/2”
YT 5108 44.45mm 1 3/4”
YT 5047 50.80mm 2”
YT 5050
YT 5045
8.00mm LENGTH METRIC LENGTH IMPERIAL 4 PACK
45.00mm 1.772”
PART NO. 50.00mm 1.969”
YT 5128 35.00mm 1.378
YT 5129
YT 5133
10.00mm LENGTH METRIC LENGTH IMPERIAL 4 PACK
45.00mm 1.772”
PART NO.
YT 6094
YELLA TERRA | 31
MOUNTING HARDWARE & SPARES
LASH ADJUSTER SCREWS
THRU HOLE CUP CROSS HOLE CUP CROSS HOLE BALL NO HOLE BALL
3/8” UNF CUP ADJUSTER
PART NO. LENGTH 4 PACK 12 PACK 16 PACK
YT 6206 24mm THRU HOLE YT 18001 YT 18011 YT 18021
YT 6161 24mm CROSS HOLE YT 18002 YT 18012 YT 18022
YT 6169 24mm CROSS HOLE H/D YT 18003 YT 18013 YT 18023
YT 6589 26mm THRU HOLE YT 18004 YT 18014 YT 18024
YT 6565 26mm THRU HOLE H/D YT 18005 YT 18015 YT 18025
YT 6061 29mm THRU HOLE YT 18006 YT 18016 YT 18026
YT 6564 30mm THRU HOLE H/D YT 18007 YT 18017 YT 18027
3/8” UNF BALL ADJUSTER 4 PACK 12 PACK 16 PACK
PART NO. LENGTH 4 PACK 12 PACK 16 PACK
YT 6746 30.6mm CROSS HOLE YT 18008
YT 18009
5/16” UNF BALL ADJUSTER
PART NO. LENGTH
YT 6156 28.6mm NO HOLE
YT 6176 30.3mm NO HOLE
POLYLOCKS
3/8” 12 PACK 16 PACK
YT 18191 YT 18192
4 PACK
YT 18190 12 PACK 16 PACK
YT 18194 YT 18195
7/16”
(b) 16 PACK
4 PACK YT 1854
YT 18193 YT 1856
12 PACK
ROCKER STUDS (c) YT 1852
(a)
SIZE DESCRIPTION 12 PACK
3/8” UNF x 7/16” UNC TYPE A YT 1853
7/16” UNF x 7/16” UNC TYPE B YT 1855
SIZE DESCRIPTION 6 PACK
7/16” UNF x 3/8” UNC TYPE C - HEMI 6 YT 1851
32 | YELLA TERRA
VALVE COVER SPACER KITS TYPE PART NO.
A YT 5123
CHEVROLET & HOLDEN LS B YT 5132
DESCRIPTION
ALUMINIUM 25mm SPACER KIT (SET 2 SPACERS & HARDWARE)
RUBBER SPACER KIT SET OF 2 RUBBER EXTRUSION SEALS PLUS NUT EXTENSION
TYPE A TYPE B
PUSHROD GUIDE PLATES TYPE 6 PACK 12 PACK
TYPE A YT 4986 YT 4988
HOLDEN 6 TYPE B* YT 4987
DESCRIPTION TYPE 8 PACK 16 PACK
1963 - 1971 PRESSED IN STUD. PRESS FIT. SUIT STD HARDENED P/RODS TYPE B* YT 3081 YT 3082
7/16” SCREW IN STUD. SUIT 5/16” UNHARDENED P/RODS, INC. BOBBINS
BRONZE LOCATING BOBBIN
HOLDEN 8
DESCRIPTION
7/16” SCREW IN STUD. SUIT 5/16” UNHARDENED P/RODS, INC. BOBBINS
BRONZE LOCATING BOBBIN
TYPE A TYPE B
*NOTE: ALL “TYPE B” GUIDE PLATES REQUIRE HEAD MACHINING
YELLA TERRA | 33
www.yellaterra.com.au
[email protected]
53 Industrial Dr. Braeside VIC, 3195
Ph: +61 3 9555 5522 Fax: +61 3 9555 4152
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