These competition water pumps are engineered for endurance racing and circle track applications. They include a revised impeller entry, a hard black-anodized finish and .100" thicker rear cover for improved lifespan. Auxiliary water outlets minimize the need to create custom plumbing systems, and auxiliary fittings are available in AN and NPT versions. These water pumps deliver optimal cooling with equal distribution to both sides of the block within 1%. With the elimination of hot spots, the engine produces the most possible power from each cylinder without detonation or pre-ignition. Other specs include a billet steel hub and heavy-duty ball/roller bearings.