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1969 Ford Mustang BOSS 429 : Classic Cars

To compete with the Mopar HEMI engine in NASCAR, Ford launched the BOSS 429 V8 in 1969. It was built as a limited production Mustang Fastback to meet the required homologation of 500 units. The '69 BOSS became the ultimate Mustang after the 'clydesdale' body was used for the 1970 version.

Ford prepared the 429 for inclusion into NASCAR's Grand National Division. They modified a version Ford's big block V8 design known as the 'Ford 385 engine' and changed the stroke from 3.85 inches to 3.59. Built as a full-on race engine the exhaust ports were so large, it was nicknamed the 'Shotgun engine'.

Power was legally rated to 375 horsepower (280 kW) although 500 horsepower (370 kW) was possible. To meet emissions regulations, a mild cam was fitted along with a smog pump and small carburetor. With a few modifications up to 600 bhp was common.

Since the new engine was too large to fit in standard Mustang body, KarKraft was hired to modify the front-end of the car into a standard Sportsroof SCJ body. They took a 428 Mach 1 and changed the inner fenders, widening the shock towers, to made additional space. A smaller brake booster was fitted and air conditioning wasn't offered.

Also included in Boss Package was the fender decals, manually-controlled hood scoop, a front spoiler, dual racing mirrors, engine oil cooler, trunk mounted battery, power steering, power front disc brakes, a close-ratio 4-speed manual, 3.91:1 Traction-Lok differential, 3/4-inch rear swaybar, F60x15 Goodyear tires and the Deluxe decor interior with 8000 rpm and AM/FM radio.1

With everything combined, the package added nearly $2,000 to the base $2,740 Mustang Sportsroof. Available options on the 429 included the functional adjustable rear spoiler.

The BOSS 429 was only produced for two years. In 1969 cars could be ordered in Raven Black, Wimbledon White, Royal Maroon, Candyapple Red, and Black Jade. In 1970 the hood scoops were painted black and the exterior colors were Grabber Orange, Grabber Green, Grabber Blue, Colypso Coral, and Pastel Blue.

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Sources : 1969 Ford Mustang BOSS 429 Photo | 1969 Ford Mustang BOSS 429 Article


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