PRW aluminum rockers are used around the world by professional racers, engine builders and hot rod enthusiasts, offering outstanding power and performance advantages for street, strip, and track applications. Made from high strength 6061-T6 aluminum extrusions, each piece is precision CNC machined and finished by hand to ensure that the customers receive the very best PRW has to offer. PRW stud mount aluminum rockers are specially machined to allow for larger springs and retainers with full-cage friction reducing needle bearings for added durability. The nose rollers and shafts are Cr40 steel, heat-treated and hardened to minimize the wear that naturally occurs between the roller tip and the valve stem. PRW offers these high-quality aluminum rocker arms for most domestic engines, with one of the largest selections of rocker arms of various ratios available to the racing and performance industry. As with other PRW products, these are in-stock for immediate delivery. All PRW aluminum rockers come complete with specially designed RockerLocs, at no additional cost.