COMP Cams 19025-16 Ultra Gold 8mm Stud Diameter 1.82 Ratio Aluminum Roller Rocker Arm for LS Series Engines For GM LS series applications CNC-machined, lightweight design removes weight and yields unrivaled quality and ratio accuracy Designed for high performance street and race engines Precision-sorted trunion bearings withstand elevated valve spring pressure and valve lift Additional clearance, up to 1.650 inches O.D. valve spring