COMP Cams Magnum Roller Rocker FS/Oldsand Oldsmobile V8 260 455 Applications is the ultimate street Rocker. With a 3 8" Stud diameter and 1. 6 ratio, it is 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 lift. With a 15 to 30 horsepower
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