1617 1968-1976 Buick 455 AC cars 4" tall water pumpFlowkooler high flow pump 1617 for Buicks with 455ci motor has a CNC machined billet impeller designed with an increased vane count and a reduced impeller clearance. 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 continues to improve impeller design. Why