Competition+ Aluminum Racing Water Pump - Chev 454 1988-Up Cars And Hot Rods With Serpentine Belt, Reverse Rotation, 2, 0" Inlet, Water Pump, Block-To-Hub 5, 750", Polished Finish, Style: Shortpilot Size: 5/8"Shaft Od: 3/4"Block To Hub Height: 5, 750"Rotation: Serpentine Reversinlet Size: 2.