Maintains lash and reduces necessary and tedious engine maintenance. 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.
They are simply the ultimate rocker arms for use in high revving street engines and many race applications. Deflection and bend test prove their aircraft grade extruded aluminum arms are superior to rival aluminum and stainless steel arms. High ratios allow for additional lift on stock and aftermarket camshafts. Yella Terra Roller Rockers are arguably the strongest aluminum rocker arms in the world. Various ratios available,catering for every camshaft grind.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.Extruded from aircraft grade aluminium,perfect for dissipating excess top-end heat.Intricately balanced CNC billet arms ensuring vital valvetrain stability - focusing attention on the harmony of the entire engine.Oversize full-complement caged bearings designed for oscillating (rocking) loads,paired with oversize precision ground trunnions to reduce friction.Built to withstand 600lbs* max open spring pressure.Ideal for harsh street and strip applications,these rockers have got what it takes to last! Our wide range of true ratios allows you to achieve high lift without relying solely on your camshaft…a trend many engine builders and racers alike are adopting to relieve the inertia on lifters and pushrods generated by aggressive and often violent ramp rates required to make big lift. Manufactured and assembled in Australia using the highest quality materials and componentry consistent with those found in our Platinum race series. No other comparable product can compete with 600lbs* maximum open spring pressure whilst retaining factory size bolt-down hardware. Designed for high revving street/strip applications.
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