NPD - National Parts Depot 2026

1971 Ford Mustang Boss 302 Prototype

One of the Most Fascinating "What-if" Vehicles in American Automotive History.

The 1971 Ford Mustang Boss 302 Prototype (chassis #100053) is one of the most fascinating "what-if" vehicles in American automotive history. While Ford officially canceled the Boss 302 program for the 1971 model year, this single factory pilot car managed to survive a series of drastic transformations.

The Identity Crisis: A Tale of Three VINs

Before ever reaching a consumer, chassis#100053 underwent three completely distinct mechanical configurations and matching vehicle identification updates:

  • The Original G-Code: Ford initially developed the car as the true successor to the highly successful 1969–1970 Trans-Am racing legends. It featured a unique, emissions-modified 1971-intent Boss 302 engine and carried a G-code VIN, which was the Ford designation for the high-revving 302 power plant.
  • The Las Vegas R-Code: When Ford abruptly withdrew from the Trans-Am racing series, executives canceled the production line. Needing a display vehicle for the Las Vegas dealer introduction show, Ford restamped the prototype with an R-code VIN. They dressed it up with Boss 351 graphics and converted it to serve as a visual Boss 351 prototype.
  • The Consumer H-Code: Once its promotional duties concluded, Ford stripped the high-performance Boss 302 engine to make the car sellable to the public. They retrofitted it with a standard, tamed 351 cubic-inch two-barrelV8 (H-code) engine, restamped the VIN a third time, and shipped it off to Wilson Ford in Huntington Beach, California.  

Discovery and Resurrecting a Legend

After disappearing intoobscurity for nearly 25 years, the vehicle resurfaced on eBay in 2004 and wasacquired by enthusiast Andrew Hack.

Recognizing its immense historical value, legendary Mustang authority Bob Perkins took on the monumental task of a meticulous concours restoration. Over his career, Perkins had hoarded rare, New Old Stock (NOS) assembly-line parts—including a factory-crated1971-intent Boss 302 experimental engine and a highly specific 4.11:1Traction-Lok rear end. Thanks to these rare components, the car was successfully restored back to its original "day-one" factory specifications, preserving the only true 1971 Boss 302 in existence.

The above photographs were taken at the Mustang Club of America’s recent 50th Anniversary event recently held at the Michelin Raceway Road Atlanta in Braselton. Georgia.  

For more information and videos click below for Jerry Heasley’s excellent interview with Bob Perkins on the background and history of the 1971 Boss 302.

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