COMP Cams Magnum Roller Rocker PontiacThese Magnum Roller Rocker Arms for Pontiac V8 265 455 Applications are the ultimate street Rocker. With a 7 16" Stud diameter and 1. 52 ratio, they are designed for Serious performance enthusiasts. All Magnum Roller Rocker Arms are constructed from 8620 chromemoly Steel, which is a superior material that will not flex and assures maximum lift. Their Roller tip reduces friction, while stiff design and superior ratio accuracy yield more effective valve
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