PRW High Performance Aluminum Water Pump -Chev, Big Block Mark Iv, 1969-87 and Some 88-91 Hd Trucks W/Mark Iv Engines, Comp+ Design With 0, 185" Steel Backplate and "O-Ring" Seal, 3/4" Pulley Pilot Shaft, 1, 75" Inlet Diameter, Std Rotation, Long-Style, Block-To-Hub 7, 3125", As-Caststyle: Longpilot Size: 3/4"Shaft Od: 3/4"Block To Hub Height: 7, 3125"Rotation: Standardinlet Size: 1.
