Tuff-Stuff Water Pump 1317NA; Standard Volume Chrome Cast Iron for 383/440 Mopar, Our SuperCool option includes a custom water impeller that flows 30 percent more coolant to reduce water temperature by up to 20 degrees,Precision-made ball/roller bearings and spin-balanced fan hub sustain higher RPMs.Pump 1317NA; Standard Volume Chrome Cast Iron for 383/440 Mopar Tuff-Stuff Water,Tuff-Stuff Water Pump 1317NA; Standard Volume Chrome Cast Iron for 383/440 Mopar, Auto Parts and Vehicles, Auto Parts & Accessories, Car & Truck Parts, Car & Truck Cooling Systems, Car & Truck Water Pumps.