1649 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 an increased vane count and reduced backing plate-to-impeller vane clearance.  It achieves greater flow rates, higher head pressure, 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.  This pump is also used with the aftermarket serpentine belt kits. 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