Edelbrock Performer-Link True Roller Timing Chain Sets Edelbrock Performer-Link true roller timing chain sets are designed for use with either performance 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 stress-proof steel. Most Edelbrock Performer-Link true roller timing chain sets have three keyways to ensure accurate timing for early or late model vehicles, and to allow you to set cam timing 4 degrees advanced, 4 degrees retarded, or stock. However, 50-state (stock replacement) sets have single keyways. Edelbrock Performer-Link true roller timing chain sets are not for use above 6,500 rpm.