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.
- Requires Shorter belt.*** Following are gates part numbers and are for vehicles equipped with A/C And Smog "or equivalent eliminator pulleys"
- 4-5/8" - Pulley Diameter
This pulley is very nice and we'll made. The groves are nice and deep unlike some other pulleys that are cheaply made.
Yes, I would recommend this item to a friend!
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Well made part
Jesse D. on
I bought this to replace my old crank pulley that sheared the bolts off that one was about ten years old and a real heavy solid steal, I can say this is made just as good if not better. Fit was perfect and it came with the correct bolts that threads perfect into my balancer. I'm very happy this was worth every penny and I didn't have to buy to other pieces in a kit I wasn't going to use, thx lmr.
ASP - Quality. Performance. Products.
ASP is one of the industry's leading producers of Mustang performance pulleys. Since 1988 ASP has been machining underdrive pulleys in house to give you the most performance for your Mustang. Each pulley goes through a CNC lathe for accurate measuring and cutting. The pulleys go through 2 cycles and a quality check to ensure each part is perfect before it leaves out of the door. Shop ASP Racing underdrive pulleys at LatemodelRestoration.com.