LT1/LT4 Gen II Engine extreme duty timing chain kit. Single roller design, with billet steel gears. Much stronger than the OEM morse link style chain. Includes chain, cam gear, crank gear, water pump drive gear. Water pump drive gear needs to be pressed onto original shaft. The chain kit will only work on 1994-1997 gen II engines that have pin drive opti-spark. In order to use this kit on 1992-1993 engines with spline drive optispark, engine must be updated with a 1994-1997 optispark unit and a 1995 timing cover.