Adjustable Timing Set; w/Thrust Bearing; 0.005 in. Undersized For Align Bored Blocks; Include durable, induction hardened steel billet gears. 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 thrust bearing for reduced friction. Ideal for all street performance and race applications.