1647 early 1969 Pontiac 4" tall "11 Bolt" water pump

This is the elusive 1969 only "short" pump e.g. 4" tall. Classic Pontiacs run hot so Flowkooler designed a high flow 11 bolt pump with a CNC machined billet impeller. With increased vane count and a reduced plate-to-impeller vane clearance it achieves higher 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! Reducing the gap between the backing plate and the impeller Way back when the internet was young a George Kujanski made a statement on a forum about his experience in reduc