Auto Specialties Harmonic Balancer Pulley with 25 Percent Reduction - Hard Black Aluminum - 820117

Harmonic Balancer Pulley: 25% Reduction (Hard Black Aluminum only)

Under drive pulley systems increase engine horsepower by reducing the amount of power required to drive external accessories. For example, the alternator, power steering, water pump and air conditioner all 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 drive the rear wheels.

[ASP820117]