- Detroit Diesel Corporation
 - Official site from DaimlerChrysler. Manufacturers of diesel and natural gas engines. - Crower Cams and Equipment Company, Inc.
- Manufacturer of aftermarket crankshafts and connecting rods.
- Lingenfelter Performance Engineering
- Designs, manufactures, and sells high-performance automotive and marine engines and components, including race engines for virtually all motorsports. Sales via catalogue.
- Callies Performance Products
- Fully engineered crankshafts and related product line for the high performance customer.
- Orbital Engine Corporation
- Developer of engine technologies using direct fuel injection that enhances fuel economy and reduces exhaust emissions.
- Ryan Falconer Racing Engines, Inc.
- Designer and builder of racing engines for off-shore powerboats, IMSA/PSR, off-road trucks, rally cars, and kit planes.
- Beck Racing Engines
- Tests, develops, and manufactures Chevrolet engine packages.
- Draime Enterprises, Inc.
- Builders of racing engines and apparel.
- Ilmor
- Makers of high performance automobile and marine engines designed for competition at the highest levels of motorsports.
 Melling Consultancy Design
- High performance engine design, consultancy, and professional witness services.- Sehr Performance Machine
- Builds engines for street rods, classics, drag racing, and more.
- Beck Racing Engines
- Builds British Leyland A-Series engines for Mini and Metro racing purposes.
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