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COMP Cams Magnum Roller Rocker Pontiac - cca1452-1 missing-image 6555cc Engine Components::Push Rods 1974These Magnum Roller Rocker Arms for Pontiac 265 455 applications are the ultimate street rocker. With a 7 16" stud diameter and 1. 65 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