1649CI 1970-1981 Pontiac Buick and Olds "11 Bolt" water pump

Classic Pontiacs run hot.  Flowkooler designed a high flow 11 bolt pump with a CNC machined billet impeller with increased vane count and a reduced clearances between the backing plate and impeller vanes.  It achieves greater flow rates, higher head pressure and a more efficient flow and it can be used with the serpentine conversion kits. 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 Olds Rocket 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 abo