| Business | Phone |
| Dennis Mitchell Racing Engines 2320 Memorial Pkwy Sw, Huntsville 35801 | (256) 534-8751 |
| General & Automotive Machine 701 Dallas St Ne, Huntsville 35801 | (256) 539-0719 |
| Huntsville Engine 100 Von Braun Dr Nw, Huntsville 35806 | (256) 858-6026 |
| R & R Speed & Machine Shop 1221 Meridian St N, Huntsville 35801 | (256) 539-0824 |
| Southern Cylinder Head 3310 9th Ave Sw # A, Huntsville 35805 | (256) 535-4403 |