Specifically designed for running a water pump only, or low mount alternator only on 1997-2013 LS engines. Mounts to the drivers side head. Machined from 3/8 thick 6061-T6 billet aluminum. Includes new pulley, grade 8 socket head allen bolts, stainless washers, and CNC lathe cut 6061-T6 billet aluminum spacers. This kit uses your stock tensioner and is designed to be used with Vortec Truck accessories.