1.6 Ratio for 3/8" Studs. COMP Cams Magnum Roller Tip Rockers are the ultimate street Rocker because they were designed with the Serious performance enthusiast in mind. They will help your engine make more power and last longer. Ultimate street Roller Rocker arm designed for Serious performance enthusiasts. Constructed from 8620 chromemoly Steel, a superior material that will not flex and ensures maximum lift. Roller tip reduces friction while stiff design and superior ratio accuracy yield more effective valve lift. For Applications with less than 350 lbs. of open spring pressure. Full Set of (16) Magnum One-Piece Chromemoly Pushrods. 5/16" Diameter