Chevrolet big block aluiminum crankshaft pulley, short water pump, double groove, v-belt, Transdapt 8877. Made of 356 aluminum alloy, heat treated to T-6 specs. Pulley diameter is 6 7/16" with a 2 1/2" depth.
HOW TO IDENTIFY YOUR PULLEY DESIGN: The "short" water pump almost touches the timing cover. The "long" water pump stands away from the timing cover about a "fingers width". The short water pump was commonly used on older big block engines. All engine accessory brackets and pulleys must be of the short pump design.
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