Edelbrock 8852 Victor Series Mechanical Water Pump 3/4 pilot shaft, aluminum, short style Unique o-ring provides a far superior seal than conventional gaskets Extremely durable as well as efficient 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