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The ProLine Water Pump Machined Aluminum Pulley Double Groove - Big Block Chevy is engineered around the manufacturer's application-specific specifications. ProLine Water Pump Machined Aluminum Pulley Double Groove - Big Block Chevy - Short Water Pump Vintage Air's ProLine machined aluminum adds the finishing touch to yVintage Air's engine. 6-7/16" Diameter, When running an engine driven fan ensure proper engagement of center hub with fan or fan spacer.