Using this aluminum pulley will slow the pump RPM so that the water will move slower thru the radiator, thus better cooling. This pulley plus our modified water pump is the best solution for your cooling system. Make sure the pulley does not hit the head when installing, if so, you might have to do some modifying of the pulley or head. remember, we are dealing with a non standard part for competition use.

Water Pump Oversize Pulley - "A" Series