This fully adjustable single roll timing chain is one of the best available for LS7 engines. This timing chain is a drop in installation which requires no grinding or hours of clearance work like double roller chains do • Fits only LS7 type gen IV engines with 3 bolt cam • Includes induction hardened steel billet gears for bullet proof durability • Feature infinitely adjustable camshaft sprocket, 6-degree maximum advance/retard • 3 keyway crank sprocket for additional 4-degree incremental adjustability • Pre-stretched, heat-treated double roller chain with heavy-duty large pin design; chain available separately • Torrington roller trust bearing reduces friction • Ideal for all street performance and race applications