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ASP Underdrive Pulleys 25% Crank, 15% Water Pump, 2 3/4" Alternator w/Full Charge at 1100 RPM (Nitride) - 79-93 Ford Mustang 5.0

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ASP Underdrive Pulleys 25% Crank, 15% Water Pump, 2 3/4" Alternator w/Full Charge at 1100 RPM (Nitride) - 79-93 Ford Mustang 5.0close

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 ..