Proflow Pro Series 8 Blade Aluminium Water Pump. Suitable for Long Nose Water Pump Small Block Chev V8 283 307 327 350 400. Proflow’s new range of Mechanical Water Pumps are made from lightweight cast aluminium and feature CNC machined threads for exact fitment. Proflow Pro Series Water Pumps are ideal for high performance street use. They feature an eight blade cast iron anti-cavitation impeller that provides optimum water flow. The impeller also limits high rpm cavitation (air in the water) and will not crack, corrode, or fatigue like aluminum impellers can. Proflow Water Pumps also feature a heavy-duty 5/8 shaft, bearing, and seal, and all necessary bracket bosses and hose connections. Proflow cast aluminium water pumps weigh approximately 30 to 50 percent less than stock iron pumps. Proflow Black Finish Pro Series Aluminium Water Pump suitable for Long Nose Small Block Chev V8 283 307 327 350 400. Heavy duty 5/8 shaft. Eight blade cast iron anti-cavitation impellers. Heavy duty bearing assembly. Suitable only for Long Nose Water Pump Small Block Chev. Please see our other listings for Short Nose Water Pump version. If you’re not sure if your engine uses a short nose or long nose water pump, then please refer to the diagram in the images showing the differences.