Chevrolet small block aluminum water pump pulley, single groove, short water pump, v-belt, Transdapt 9478. Made of 356 aluminum alloy, heat treated to T-6 specs. Pulley diameter is 5 5/8" with a 3" depth.
HOW TO IDENTIFY YOUR WATER PUMP DESIGN: The "short" water pump almost touches the timing cover. The "long" water pump stands out from the timing cover about a "fingers width". Short water pumps were commonly used on 1955-1974 Chevrolet small blocks but can be used on newer applications where the older short water pump is used. To use this pulley on newer engines, all accessory brackets and pulleys must be designed for the short water pump.
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