To be used when installing our aluminum pulleys onto the water pump when not using a conventional fan. These flat socket cap screws measure 5/16"-24x3/4" and are packaged four per set.
What do Underdrive Pulleys do? Underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. For example, the alternator, power steering, water pump and air compressor rob horsepower from the engine. By replacing factory-sized crank and accessory drive pulleys with a resized pulley, the accessories are slowed, resulting in more ..
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