Why do you need Chevy pulleys? After all, you've already got Chevy pulleys on the front of your motor, running all your accessories, right? That's the problem! See, your Chevy pulleys sap a ton of power from your engine. The alternator, air conditioning, power steering, and emissions gear take considerable amount of energy to turn, and they get that energy from your engine via the Chevy pulleys. But there's a way to keep the conveiniences that your accessories provide, but get back some of that horsepower, and it involves tweaking your Chevy pulleys. Well, perhaps "tweaking" your Chevy pulleys isn't the right term. More like "replacing" your Chevy pulleys with a set of our Chevy performance pulleys. These Chevy underdrive pulleys are slightly larger in diameter than your original Chevy pulleys. If you visualize your Chevy pulleys in your mind, you'll realize that larger Chevy pulleys take less power to rotate (and rotate more slowly than stock). Your accessories will still work correctly with new Chevy pulleys, and your engine will be able to work harder at moving your wheels rather than your Chevy pulleys. When you're looking for every horsepower, adding new Chevy pulleys is one of the most cost-effective ways to find them. We have Chevy pulleys in stock for a ton of different models, so check our application listings to see if we have Chevy pulleys for your hot rod.