The Horsepower Factory,

485 Old Naylor Road, Finger, TN 38334

"Alan done a cam install and tune along with deleting the vvt/dod stuff in my 2013 Silverado 1500. Really woke the truck up. Extremely happy with it. Great guy and I highly recommend using him."

"The owner has a funny- looking head but he's a cool guy."

"Alan is awesome! Tuned my silverado and recalibrated the speedometer after the regear. Trucks like a totally different truck."

"I just got my truck back from Serra Chevrolet where they totally messed up the tune. Told me I had bad catalytic convertors. Alan took me in a 5pm on a Friday and worked his magic. Truck runs better than it did when I first had the 6L built and installed. Now I feel comfortable making that 800 mile drive home. Thank you Alan"

"There aren't many professional EFI tuners in this area , but if you are looking for a knowledgeable, professional tuner , for your modified EFI vehicle , this is where you need to be. He has fixed my tune , where someone else had done a half assed drag tune . It has an LS with a big cam, stall , built trans, gear, etc , and drives as easily and reliably as stock. Great idle and traffic manners. It had neither, before Alan McCorkle tuned it. If you are reading this , this is the guy you're looking for. A professional."