Page 668 - 2018 Racecar Engineering Drag Racing Parts and Accessories Catalog

Yella Terra brings affordable race rockers into the 21st century, eliminating the problems associated
with studs, guide plates and stud girdles. Serious engine builders use and recommend shaft rockers
for a more stable valve train and more horsepower.

Platinum Twin Shaft Rocker Arms Ultralite Rocker Arm Sets
Intake and exhaust rockers are joined in pairs Advanced Ultralite Rocker Arm Sets
on a shaft that is 22% larger and engineered offer 50% less nose weight when
for extreme RPM. Maximum width bear- compared to OEM rocker arms, increas-
ings deliver greater rigidity, resistance to ing RPM potential, while also providing
breakage and superior load carrying ability, added strength and durability. Kits, which are of-
eliminating the need for screw-in studs. fered in standard or high rocker ratios, are designed
Rocker arms bolt to existing 7/16" stud mountings for hydraulic camshaft applications with a maximum open spring
with bolts supplied. Easy to service in the field. Sold in sets of 16. pressure of 400 lbs.
Part No. Description Cylinder Head Ratio Part No. Description Ratio
OEM/Bowtie/AFR/Dart/ Chevy LS1 5.7L, 1997-Up Corvette;
YTRYT6008 SB Chevy 265-400 1.55/1.55 YTRYT6638* 1.7
World/Brownfield 1998-02 Camaro/Firebird, Adjustable
OEM/Bowtie/AFR/Dart/ Chevy LS1 5.7L, 1997-Up Corvette;
YTRYT6009 SB Chevy 265-400 1.6/1.6 YTRYT6645 1.8
World/Brownfield 1998-02 Camaro/Firebird, Hyd.
OEM/Bowtie/AFR/Dart/ Chevy LS1 5.7L, 1997-Up Corvette;
YTRYT6341* SB Chevy 265-400 1.6/1.5 YTRYT6646 1.7
World/Brownfield 1998-02 Camaro/Firebird, Hyd.
YTRYT6620 SB Chevy 265-400 Dart Pro-1 1.5/1.5 YTRYT6667 Chevy LS3 6.0L, 2008-13 Corvette; 2010 Camaro SS, Hyd. 1.7
SB Ford Windsor Brodix/Dart/Edelbrock/ YTRYT6685 Chevy LS3 6.0L, 2008-13 Corvette; 2010 Camaro SS, Hyd. 1.85
YTRYT6323 1.6
289-351W Motorsport/Trick Flow YTRYT6670 Chevy LS7 7.0L, 2006-13 Z06 Corvette; 2014 Camaro Z28, Hyd. 1.8
* Rocker arms in this kit have an extra .070" pushrod offset on intake for * Kit featuring adjustable rocker arms requires YTRYT5123 valve cover
repaired or wider ports. spacers for clearance.
Platinum Single Rocker Pedestal And Saddle Shims
Shaft Rocker Arms For Twin Shaft Platinum Rockers.
Affordable shaft-type platinum Part No. Description
rockers for canted valve engines such YTRYT6239 Shim, .025" (0.6mm) Black, Each
as Chevy and Ford. Dowel pins under YTRYT6240 Shim, .050" (1.3mm) Gold, Each
each mount prevent rocker misalign- YTRYT6241 Shim, .100" (2.5mm) Silver, Each
ment and rotation. Sold in sets of 16.
Part No. Description Cylinder Head Ratio LS Valve Cover Spacers
YTRYT6317 BB Chevy 396-454 OEM/Brodix -1, -2 1.7
YTRYT6603 BB Chevy 396-454 OE/Brodix/Dart/Edelbrock/World 1.7 Engineered for popular GM LS
Ford 351C, engines, spacers provide necessary
YTRYT6321 OE/CJ/SCJ/Motorsport/Trick Flow/Wilburt 1.73
351M-400, 429-460 clearance when installing aftermar-
ket rocker arms, such as Ultralite
adjustable units. Spacers are .500"
tall and sold per pair, complete with seals.
Part No. Description
YTRYT5123 LS Valve Cover Spacers
YTRYT5132 Replacement Seal

Traction-Loc Differentials
Fully loaded differential carriers are manu-
factured using billet steel left and nodular
Duragrip iron right cases fitted with forged 4320 steel
Positraction Differentials internal gears and premium Raybestos clutches.
Duragrip differentials incorporate Raybes- Ideal for street/strip applications, fully rebuildable units
tos clutches for effective clutch lock-up, utilize an aggressive design for maximum traction.
while delivering torque to the tire with the Part No. Description
most traction. Fully rebuildable units feature YKNYDGF8-28-AG Ford 8", 28-Spline Axles, Aggressive Design
YKNYDGF9-28-AG
Ford 9", 28-Spline Axles, Aggressive Design
nodular iron cases fitted with forged 4320 YKNYDGF9-31-AG Ford 9", 31-Spline Axles, Aggressive Design
steel internal gears for maximum durability.
Part No. Description Grizzly Lockers
YKNYDGF8.8-28-1 Ford 8.8", 28-Spline Axles
YKNYDGF8.8-31-1 Ford 8.8", 31-Spline Axles Grizzly Lockers deliver full, 100% power to
GM 8.875" 12-Bolt Passenger, both tires, while allowing disengagement for
YKNYDGGM12P-3-30-1
30-Spline Axles, 3.08-3.90 Gear Ratios smooth turning. Differentials are fully as-
YKNYDGGM7.5-3-28-SM GM 7.5"/7.625" 10-Bolt, 28-Spline Axles sembled in the USA using premium 8620 steel
YKNYDGGM8.5-3-28-1 GM 8.5" 10-Bolt, 28-Spline Axles components and feature a patent-pending
YKNYDGGM8.5-3-30-1 GM 8.5" 10-Bolt, 30-Spline Axles
design. Covered by a 1-year warranty.
Part No. Description
YKNYGLD60-3-35 Dana 60, 35-Spline Axles, 4.10 And Lower Gear Ratios
YKNYGLD60-4-35 Dana 60, 35-Spline Axles, 4.56 And Up Gear Ratios
YKNYGLF9-31 Ford 9", 31-Spline Axles
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