COMP Cams 7102 Billet Double Roller Timing Chain Set for GM Gen III LS1 LS2 24T 4.8 5.3 5.7 6.0 EnginesKeyway Adjustable Billet Timing Sets; GM Gen III (LS1 LS6) Models w 24 Tooth Reluctor * Induction hardened steel billet gears for durability * 9 keyway crank sprocket for 2 degree incremental adjustability, 8 degree maximum advance retard * Pre stretched, heat treated double roller chain with heavy duty large pin design * Includes Torrington roller thrust bearing for reduced friction