All Milodon High Performance water pumps start with new, high quality steel or aluminum castings, that use large diameter shafts and heavy duty bearings. All pumps are direct factory replacements equipped with all hose connections and bosses. All Milodon Performance water pumps are protected by Milodon's 100% satisfaction guarantee. Milodon High Volume water pumps feature balanced distribution and improved efficiency, close tolerance impellers that increase coolant flow up to 30%. This increases the pressure within the block to help prevent hot spots and steam pockets, as well as, improve coolant flow through the radiator. A nonrestrictive, high flow thermostat is highly recommended to enable the Milodon High Volume water pump to work to its highest capability.