1691 1993-1996 Corvette LT1 water pumpIf you have an LT1 in your Corvette and you find it runs a little hotter you're in luck. We designed a impeller with an increased vane count and a reduced impeller vane clearance to take care of the problem. It achieves greater flow rates, higher head pressure and a more efficient flow. The impeller color is due to Type II Class II military grade surface coating which protects against corrosive fluids. FlowKooler introduced the first hi flow pumps and