1970 Ford Mustang Boss 429

This 1970 Ford Mustang Boss 429 is one of approximately 500 examples produced for the model year and was assigned Kar Kraft serial number KK2288. Finished in Grabber Blue over white vinyl upholstery, the car is powered by a 429ci Boss V8 linked with a four-speed manual transmission and a 3.91 Traction-Lok differential. Factory equipment includes power steering, power-assisted front disc brakes, 15″ Magnum 500 wheels, a functional front spoiler, the Convenience and Decor groups, a Deluxe rim-blow steering wheel and belts, a tachometer, a console, and an AM radio, and a rear spoiler and Sport Slats have been fitted. Documentation accompanying the sale includes a letter from Boss 429 expert Bob Perkins attesting to the car’s originality and mileage.

A letter from Bob Perkins details transfer of ownership c.1988, at which time the car had a reported 4,011 miles. Perkins also documented installation of the rear wing, reinstallation of smog equipment, and engine-bay detailing at that time.

The 15″ Magnum 500-style wheels are mounted with F60-15 Goodyear Polyglas GT tires. The Boss 429 model was equipped with revised control arms, a higher-rate front anti-roll bar than other Mustang variants, a rear anti-roll bar, and a competition suspension with staggered rear shocks. Power-assisted brakes with discs up front and drums out back were standard on the 429, with the front brakes reinforced with heavy-duty hubs and rotors as well as oversized spindles. Power-assisted steering was also specified from the factory.

Kar Kraft was commissioned by Ford to modify Cobra Jet Mustangs with a larger 429ci V8 featuring “crescent”-shaped combustion chambers. It came from the factory with an aluminum intake manifold and a four-barrel Holley 735-cfm carburetor. Output was rated at 375 horsepower when new.

Power is sent to the rear wheels through a four-speed manual transmission and a 3.91 Traction-Lok differential.