Edelbrock 8821 Polished Long Style Victor Series Mechanical Water Pump Unique o-ring provides a far superior seal than conventional gaskets Extremely durable as well as efficient 5/8 pilot shaft, polished, long style water pump Provides maximum flow, maximum pressure and equal distribution to both sides of the block within 1% Includes heavy-duty roller bearing assemblies built to withstand higher torsional loads, billet steel hubs, and leak-proof seals