This pump fits all GM LS series engines, but will require the use of aftermarket competition brackets. It measures 6" from block surface to hub and features a relocated thermostat housing on the top. It is a standard clockwise rotation design to accommodate racers using a simplified accessory drive setup. It is primarily designed for use in racing applications and will require the use of longer than stock mounting bolts. Can be modified for street applications, but will not fit stock accessory brackets. Can not be used with a stock manifold, must be used with carbureted style manifolds. 1.85" inlet diameter.