Edelbrock 8811 Victor Series Mechanical Water Pump 5/8 pilot shaft, polished, long style 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 Unique o-ring that provides a far superior seal than conventional gaskets