Timing Set Race Billet Z-Racing Roller Timing Kit Race Billet Z-Racing Roller Timing Kit; Incl.BilletSteel CamSprocket/9Key BilletSteel CrankSprocket/.0.5in. Extreme Duty True Roller Z Chain/Thrust Needle Bearing; .390RaisedCam; FEATURES: Both Sprockets Induction Hardened Billet Steel Machined On State Of The Art CNC Equipment 9 Keyway Crank Sprockets Plus/Minus 6 Degrees Premium True Roller Chain w/0.25 in. Dia. Rollers Cold-Rolled And Hardened To Exact Standards Increased Load And RPM Capabilities Each Set Is Custom Hand-Matched At Cloyes Factory As a Tier 1, OEM supplier to General Motors, Daimler-Chrysler, Ford and Nissan, we are well positioned to handle the industry trend toward shifting the design, testing and validation of systems to the supplier. We are the largest timing gear and sprocket OEM provider and have established this position through quality, engineering, manufacturing and superior customer service. Our Aftermarket Division is the industry leader, offering the most complete line of replacement timing drive systems and components through the aftermarket distribution network. The Cloyes name is also well known and respected in the high performance world. Cloyes developed and patented the very first True Roller timing set in 1970. This innovative product and later patented products, like the Hex-a-Just timing system, revolutionized the high performance timing field.