When it comes to horsepower gains that don’t break the bank, nothing’s quite as effective as a set of underdrive pulleys, but you need to understand how they work as well as what the benefits ...

A few months and issues of your favorite Mustang magazine have gone by, and we hope you've had a chance to read and absorb the cover story of our Oct. '12 issue. In the article (“The Main Event ...

Underdrive pulleys are one such alteration. The concept is simple: All the belt-driven accessories on the engine (power steering, alternator, water pump, and so on) require power for rotation.

The use of underdrive pulleys became common to the public in the 1970s, although the origin of the use of underdriven pulleys dates back to the earliest days of automotive racing. With constant ...