The Boss 429 is arguably one of the rarest and most valued muscle cars to date and Wellborn Musclecar Museum owns the best known surviving example of this treasure. This Boss 429 is the lowest mileage, best preserved, original 1970 Boss known to exist.

In total there were 859 original Boss 429s made. The origin of the Boss 429 comes about as a result of NASCAR. Ford was seeking to develop a Hemi engine that could compete with the famed 426 Hemi from Chrysler in NASCAR’s Sprint Cup Series (then known as “Grand National Division”). NASCAR’s homologation rules required that at least 500 cars be fitted with this motor and sold to the general public. After much consideration, it was decided by Ford that the Mustang would be the car that would house this new engine.

The Boss 429 engine was derived from the Ford 385 engine. The Mustang’s body however was not wide enough to encompass the massive Boss 429 engine and as a result, Ford hired Kar Kraft out of Dearborn, MI to modify existing 428 Cobra Jet Mach 1 Mustangs to properly fit the new Boss 429 engine. Kar Kraft made extensive modifications to the Mustang, including widening the shock towers and extended out the inner fenders to allow this massive engine to fit. These cars were rated conservatively at 375 hp and 450 lb·ft of torque. Actual output was well over 500 horsepower.

Visit the Wellborn Musclecar Museum today and marvel over this beauty.