The Edelbrock Victor Series Circle Track Water Pump is designed for circle track and endurance racing applications. This water pump provides maximum cooling with equal distribution to both sides of the block within 1 percent. This helps prevent hot spots, which can cause detonation and pre-ignition. They feature a revised impeller entry, a black anodized finish and 0. 100 inch thicker rear cover for greater durability. Auxiliary water outlets ease fabrication of custom plumbing systems and auxiliary fittings are available as AN or NPT. This 3/4 inch pilot shaft circle track water pump comes with heavy-duty 3/4 inch ball/roller bearing. It has 3/8 inch NPT auxiliary fittings at 45 degrees to the block. The dimension from block surface to hub is 5-13/16 inch and its inlet diameter is 1. 85 inch. Other features include billet hub and heavy-duty ball/roller bearings.