Edelbrock 1966-1974 Chevrolet C2-C3 Corvette Timing Chain And Gear Set BBC Sng/KeywayEdelbrock part #7809 Performer Link timing chain is for use with Edelbrock or stock cams. They have a solid bushing chain for a true bearing surface that rolls with the sprockets, eliminating chain stretch. Cam sprockets are made from 35,000 psi tensile strength cast iron. Crank sprockets are made from billet SAE 1144 steel and induction heat treated. Four Performer Link sets are stock replacement parts and 50 state legal (see listings in bold type).