Performer-Link timing chain sets are 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. Crank gears are machined from SAE-1144 stressproof steel. Three Performer-Link sets are stock replacement parts and 50-state legal. Performer-Link timing sets are not for use above 6500 rpm.