These water pumps are designed for small-block Chevy circle track and endurance racing applications. They feature a revised impeller entry, a black anodized finish and . 100" thicker rear cover for greater durability. Auxiliary water outlets ease fabrication of custom plumbing systems and auxiliary fittings are available as AN or NPT. These water pumps provide max cooling with equal distribution to both sides of the block within 1%. By eliminating hot spots, the engine produces optimum power from every cylinder without detonation and pre-ignition. Other features include cast-iron impeller, billet hub and heavy-duty ball/roller bearings. Independent testing by Ed Pink proved that the Edelbrock water pumps flow more coolant through the engine than our competitors. The Edelbrock pump generated 11. 8 gallons per minute more flow than the leading pump with a similar design. All other pumps were unequal in distribution, one brand as much as 2 gallons per minute per side. The Edelbrock pump achieves equal distribution within 1/10th of a gallon. According to Ed Pink, "This pump flows more water through the entire engine and radiator system. The equal water flow and pressure on both sides of the engine is an outstanding achievement. " All water pumps were flow tested at the same speed using laboratory-type, in-line turbine flow meters.Pit Stop USA offers Edelbrock Victor Circle Track Water Pump - SB Chevy - NPT Fittings At 45° to The Block - Dimension From Block Surface to Hub: 5-13/16" - Heavy-Duty 3/4" Ball/Roller Bearing 8817 at low everyday prices. Be sure to check out all of our products from Edelbrock including Edelbrock Small Block Chevy Water Pumps.