Water Pump, Cast Aluminum High Flow, 4 13/16" From Block Surface to Hub, 1973-91 AMC V-8P N P0241 521 This high flow cast aluminum water is a long style pump and features a 3 4" ball bearing, 1. 80" inlet diameter 5 8" pilot shaft, measures 4 13 16" from block surface to hub Replaces leaking original water pump High flow design cools over 30% better than factory cast iron standard water pumps making it ideal for warmer climates and or modified engines 7 lbs. lighter than factory cast iron water pump Long design measures 4 13 16" from