COMP Cams Timing Chains 7104 COMP Cams Keyway Adjustable Billet Timing Sets include induction hardened, precision machined steel billet gears and pre-stretched, heat-treated double roller timing chains with heavy-duty large pin design. They feature a 9 keyway crank sprocket for 2? incremental adjustability with 8? maximum advance or retard. These timing sets are ideal for all street performance and race applications. Billet Timing Set, CRB 1-Bolt 9-Keyway COMP Cams Single Bolt Big Block Chrysler Keyway Adjustable Billet Timing Set COMP Cams Billet Timing Set CRB 1-Bolt