Chevrolet big block aluminum water pump pulley, short water pump, single groove, v-belt, Transdapt 8874. Made of 356 aluminum alloy, heat treated to T-6 specs. Pulley diameter is 6 7/16" with a 2 7/8" 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". Short water pumps were commonly used on the older big blocks. All accessory brackets and pulleys must match the short water pump design. Chevrolet big block aluminum water pump pulley short pump single groove Transdapt 8874 8874 HOURS: 11:00 am to 6:00 pm Monday - Friday Eastern Standard Time We welcome CANADIAN customers! For ordering information, click on "Orders To Canada" at the top left side of this page. We will not ship to freight forwarding - expediting companies. PAYMENT METHODS: PayPal, Visa, Mastercard, Discover, American Express, money orders.