Water Pump Pulley, 4.2″ Dia

4.2″ diameter Water Pump Pulley

Designed to reduce the horsepower drain and slow down the water moving through the radiator to allow it time to cool, it’s very important for the higher RPMs we run today. This oversize pulley is 4.2″ diameter, earlier cars used a 3.875″ wide pulley. Use of a high capacity water pump helps to reduce cavitation in the water jacket, particularly at high RPM, as well as circulating a greater volume of coolant.