Simply put, a stock volume water pump falls sadly short on a stock 460 powered truck, they simply don’t move enough volume. Even stock engines will fluctuate in temperature drastically from this problem. I have never seen anyone’s water pump keep up with these units. If you do any towing or have increased the power of your engine you will need help to move that massive amount of coolant faster. Your Ford engine and the ECU needs to stay within a specific temperature range to operate correctly. Too cold and you waste fuel, get too hot and the ECU leans the air fuel curve and overheats the engine even further. We searched high and low for a pump that actually worked with the stock radiator tubes, pump shaft, and fan bolt pattern. We were thrilled to find Flowkooler water pumps. But before we offered or recommended any part to anyone we thoroughly tested these first. We installed a few on our built up engines we were installing. What we found was this pump always held the temperature much much closer to the thermostat rating than you could ever expect out of a stock water pump.