COMP Cams Sportsman Stainless Steel Valves [4.930 Length | Single Lock Groove | Exhaust | 1.570 Head Diameter | 8mm Stem Size] (GM LS1, LS6 & LS2) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS