1620 1962-1966 Buick 401 425 Nailhead water pump for AC cars

Flowkooler high flow pump 1620 for the Buick Nailhead has a CNC machined billet impeller designed with an increased vane count and a tighter 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 is increased flow so important to cooling a hot Pontiac engine? Because it has been proven time and time again that reducing the cycle time between the heat source and the heat sink creates more opportunities to shed heat and drop engine temperatures. From 0-3,300 RPM…Nothing Beats a FlowKooler! General Specifications: Type of Material of Pump Body Aluminum Number of vanes on Impeller 12 swept Direction of Rotation CW Fan Hub Height 3 9/16" Shaft Diameter 5/8" Hose Connections 1st 2nd Gender m NA Diameter 3/4" NA Threade