COMP Cams Magnum Roller Rockers Ford SBThese Magnum Roller Rocker Arms for Ford V8 289 351W (Rail Type) 1968 89 Applications are the ultimate street Rocker. With a 3 8" Stud diameter and 1. 6 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
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