Our Front Runner system came with a new LS-style water pump with 3/4-inch bearing assembly and pulley flange designed to work with the kit. According to Vintage Air, some newer LS engines require that the lower bolt, or bolts, be shortened to clear the timing cover. We removed the bolts, took some off their tops and reinstalled, torquing them to 11 ft-lbs. The water pump requires a ’97-03 LS1-style thermostat (not included), and the little ear on the housing needs to be ground off. Vintage Air also offers a thermostat housing that can be rotated to accommodate different radiator outlet configurations.