The high performance Aeroflow GM LS cast aluminum mechanical water pump is designed for street applications. They are compatible with all O.E.M. accessories and pulleys. Made from lightweight cast aluminium which offers weight savings along with increased durability and cooling potential. They feature a precision cast-iron impeller design and pressure-balanced water passages which equalize flow and minimize engine hot spots at any speed. The impeller also limits high rpm cavitation which will not crack, corrode, or fatigue. Suits 1997-2003 GM LS Series engines.