1674 1971-1974 Chevy Corvette 454 Big Block Short 5-3/4" water pumpFlowkooler high flow pump 1674 has a 16 vane CNC machined billet impeller. Its shrouded and ported and, with the increased vane count and a reduced impeller clearance, it really pumps the coolant. It achieves greater flow rates, higher head pressure and a more efficient flow. The impeller's 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