Prewitt Racing
- Builds custom engines for Ford or Chevy, custom tuning, chassis work, drivetrain and electrical work as well as fabrication and installation of supercharges, turbo kits and nitrous oxide.
- http://www.prewittracing.com/

Slark Race Engineering
- Builds engines for race and speed events including Mini Miglia, Mini Sevens and hillclimb/sprint cars.
- http://www.slarkraceengineering.co.uk/

Shafiroff Racing Engines and Components
- Custom built race engines, short block kits, cylinder head packages, balanced rotating assemblies, and parts and accessories.
- http://www.shafiroff.com/

Ryan Brown Inc
- Builds racing engines, fuel systems and ignition components for all types of oval and drag racing.
- http://www.ryanbrownracing.com/

Enders Racing Engines
- Includes engine tour, classifieds, news and project information. Engine builder and machine shop services.
- http://www.endersracingengines.com/

Autoshop Racing Engines
- Designs and develops racing engines for drag racing, road racing and extreme street performance.
- http://www.autoshopracingengines.com/

Swap Shop
- Offers engine rebuilding, swaping, replacing, and upgrading services.
- http://efiswapshop.com/

Ed Pink Racing Engines
- Offers engine building, testing, design, and development facilities.
- http://edpink.com/

HP Racing Engines
- Performance engine machine shop operations, engine coatings, and chassis work for high performance and racing vehicles.
- http://www.hpracingengines.com/

Sonny Leonard Racing Engines
- Builder of engines for high performance street rods, drag racing, oval track and marine applications.
- http://www.sonnysracingengines.com/

Florida Performance Machine
- A complete racing and performance shop, providing engine building, race car chassis setup and dyno testing.
- http://www.floridaperformance.com/

Dutchess Automotive Machine Shop
- Engine work for racing cars. Balancing, flow bench, dynomometer services. Race engine research and development.
- http://dambest.com/

Midstate Machine
- A complete automotive machine shop, specializing in engine rebuilding, crankshaft grinding, cylinder head repair, engine machining and balancing with flow bench testing.
- http://www.automotivemachineshop.com/

Quorn Engine Developments
- Motorsport engine specialists in the UK.
- http://www.qednet.demon.co.uk/

Weseman Engineering
- Building racing engines for sprint cars, late model, modified and super stock in Minnesota.
- http://wesemanengineering.com/

Fonse Performance
- Supplying high performance and racing engines to the marine and racing community. Dyno and flow bench testing available.
- http://www.fonseperformance.com/

Davis Technologies
- Builder's of a traction control, sensorless electronic traction control system for racing, virtually undetectable. Also, wiring harnesses and driver cooling systems.
- http://moretraction.com/