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The short water-pump GM reference height from the block mounting flange to the pulley mounting flange is 5-5/8 inches. The long water-pump reference height is 7 inches. To make this even more confusing, Chevy also used late-model serpentine-belt short water pumps, but these use a 5-13/16-inch (5.8125-inch) reference height for ’84-’92 Corvettes. There is actually yet another reverse-rotation water pump used in serpentine-belt applications for ’87-’94 small-blocks and 90-degree 4.3L V-6 engines that uses a 6-15/16-inch reference height. Whew! View Related Article
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