Before Comp Cams introduced the revolutionary Pro Magnum RockerArms there were only two alternatives in competition rocker arms: Stainless Steel for strength and reliability or Aluminum for light weight and low cost. With the Pro Magnum Rockers you get the best of both worlds. Pro Magnum Rockers are made of 8650 chromemoly steel. This material is some three times stronger than 7075-T6 aluminum which is used for most aluminum rocker arms.
Comp Cams engineers used advanced computer technology (including Finite Element Analysis) to refine the Pro Magnum Rocker. Strength was added where it was needed and reduced mass in low stress areas. The result: Pro Magnum Rocker Arms have less weight (5%) at the valve than most aluminum rockers. This means more RPM and valve train stability.
The unique design of the Pro Magnum Rocker enables Comp Cams to use a larger trunion with more needle bearings. This spreads the load more evenly and the rocker will last longer. Other features include an integral pushrod seat that insures accuracy and saves weight, a unique rocker design also provides plenty of clearance for most high performance valve springs.
