it is just run in and needs the roller rockers adjusting. Allows for smoother,quieter operation Maintains lash and reduces necessary and tedious engine maintenance. I have a set of Street Terra adjustable roller rockers on my new motor. 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.High ratios allow for additional lift on stock and aftermarket camshafts. 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.Single shaft bolt-on also available for cantered valve cylinder heads.Allows for smoother,quieter operation Maintains lash and reduces necessary and tedious engine maintenance. Ford V8 Windsor Platinum 7/16'1.6 Ratio Rockers (YT 6610). Intricately balanced CNC billet arms ensuring vital valvetrain stability - focusing attention on the harmony of the entire engine. No other rocker system compares with Yella Terra.Oversize full-complement caged bearings designed for oscillating (rocking) loads,paired with oversize precision ground trunnions to reduce friction.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.Proven bolt-on shaft design featuring heavy duty 7/16”and 10mm hardware for stability and durability well beyond the chequered flag. 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 sourced locally and from the USA. No other rocker system compares with Yella Terra Platinum race series.
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