1776 1971-1985 Buick Chevy GM Olds Pontiac 5 9/16" short water pump for Non ACDO NOT MIS ORDER ALWAYS CHECK THE PUMP HEIGHT Flowkooler high flow pump 1776 has a CNC machined billet impeller designed with an increased vane count and a reduced plate to 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