1733 1965-1974 Inline 6 cylinder 194 230 250 3 1/8" water pumpIf your running a riser set up and find you are heat cycling it might mean trapped air. The best solution is to build pressure to and the best tool is pump 1733. We designed an impeller with an increased vane count and a reduced impeller vane clearance to take build that pressure. It achieves greater flow rates, higher head pressure and a more efficient flow. The impeller color is due to Type II Class II military grade surface coating which protects