COMP Cams 3172KT Adjustable Performance Timing Chain Set for GM Gen IV LS 4.8 5.3 6.0 3 Bolt EnginesThis fully adjustable single roll timing chain is one of the best available for LS3 engines. This timing chain also works on LS2 "58X" engines requiring a "4 pole" cam gear. This timing chain is a drop in installation which requires no grinding or hours of clearance work like double roller chains do. Include induction hardened steel billet gears for bullet proof durability Feature infinitely adjustable camshaft sprocket, 6 degree maximum advance