SBC 283-400 ci Crankshaft Pulley. Double Groove, for Long Water Pump. 6.6" Diameter. Satin Aluminum. Also available in Polished Aluminum - part #S9485POL. Available in chrome Aluminum by special order - Email or call for availability in chrome aluminum - part #S9485C.
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UNSURE WHETHER YOU HAVE A SHORT OR LONG PUMP? IF YOUR ALTERNATOR IS ON THE PASSENGER SIDE OF THE ENGINE THEN IT'S A LONG WATER PUMP OTHERWISE IT IS A SHORT WATER PUMP.