Big block Chevy crankshaft pulley, triple groove, satin aluminum, for long water pump. Also available in polished and chrome aluminum.

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. ANOTHER GOOD INDICATION IS IF YOU CAN FIT YOUR HAND BETWEEN THE WATER PUMP AND THE TIMING COVER THEN YOU HAVE A LONG WATER PUMP.