HOLDEN V8 Early Carby 253 308 Shaft Roller Rockers for 308-3 Heads. Platinum Bolt on.

YellaTerra YT5020 Platinum Race Shaft Rockers Early Carby 308-3 Heads, Holden V8 253 308

The ultimate performance rockers for Aussie V8's 

YT 5020 Yella Terra designed these high quality Shaft Rockers for strength, built to race. No other roller rocker system compares with Yella Terra Platinum race series for your early Holden 308 V8 -3 Heads. Manufactured and assembled in Australia using the best quality materials and componentry sourced locally and from the USA.

Our wide range of true ratios allows you to achieve high lift without relying solely on your camshaft… a trend many Holden engine builders and racers alike are adopting to relieve the inertia on lifters and pushrods generated by aggressive and often violent camshaft ramp rates required to make big lift. 

Yella Terra proven bolt-on shaft rockers design for your 308 Holden V8, featuring heavy duty 7/16” and 10mm hardware for stability and durability well beyond the chequered flag.

Why Choose Yella Terra Platinum? 

• Wide body arms for greater strength and resistance to deflection, extruded from aircraft grade aluminium for the highest RPM potential. Built to withstand 900lbs* max open spring pressure
• Oversize full-complement caged bearings designed for oscillating (rocking) loads, paired with oversize precision ground trunnions to reduce friction.
• Intricately balanced CNC billet arms ensuring vital valvetrain stability - focusing attention on the harmony of the entire engine.
• Single shaft bolt-on also available for cantered valve cylinder heads.
• Extruded from aircraft grade aluminium, perfect for dissipating excess top-end heat.
• Yella Terra proven bolt-on shaft mount design that mounts both inlet/exhaust to common shaft, effectively increasing footprint and clamp load twofold without any further cylinder head modification.
• Various ratios available, catering for every camshaft grind. High ratios allow for additional lift on stock and aftermarket camshafts.
• Chrome moly steel hardened and ground roller tips of generous diameter (positively retained by internal circlip) preventing abrasion of valve tips and guides commonly seen with non-roller tip rockers. Allows for smoother, quieter operation Maintains lash and reduces necessary and tedious engine maintenance.

* ALSO AVAILABLE TO SUIT APPLICATIONS USING A 0.150" TALLER VALVE (YT 5020A) * 

• PART NO:     YT-5020

  MAKE:        HOLDEN

  ENGINE:   253, 308 CARB V8 with 308-3 Heads

  YEAR:       1969-1988

  PART TYPE:   ROLLER ROCKERS

  MOUNTING STYLE:   SHAFT MOUNT

  ROCKER ARM RATIO:   1.65

  STUD SIZE:           7/16"

  ADJUSTABLE:       ADJUSTABLE

  ROCKER ARM STYLE:         Shaft - FULL ROLLER

  SHIMS INCLUDED:             YES

  ROCKER MATERIAL:          ALUMINIUM

  SELF-ALIGNING:                 NO

  ROCKER ARM BODY STYLE:            WIDE BODY

  ROCKER ARM NUT STYLE:               CAPSCREW

  MAX SPRING DIAMETER :                1.550"

  MAX OPEN SPRING PRESSURE:    600lbs-1000lbs

  QTY:        SET OF 16

  Hardware included:  Yes

• BRAND: PLATINUM

  NOTE:     To machine for Platinum rockers, remove 0.300" from Rocker Pads, drill and tap for 7/16" UNC.

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