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ASP Underdrive Harmonic Dampner 25% Crank Pulley w/ with Full Charge at 850 RPM (Black Alum) - 01-02 Ford 4.2
Auto Specialties - 820130
$318.00
- Brand:: Auto Specialties
- Category: Belts & Pulleys
- Product Code: ASP-820130
- SKU: ASP-820130
- MPN: 820130
- Weight: 9lb
- Some orders may require up to a 6 week lead time
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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 horsepower available to the drive wheels. Typically, a set of Auto Specialties street pulleys will increase horsepower by 12-15, and increase mileage by 2 to 3 MPG. All pulleys are manufactured from Billet Steel or Aluminum, exceeding factory quality.
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