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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. 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.

Although the fastback was a striking design, Ford refrained from the large stripes and lettering found on models like the 302 and Mach 1. Instead a small BOSS 429 decal was fitted on the fender and a huge front scoop was used on the hood with manually-controlled butterfly valve.

The car 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.

Chassis & Sales

1969 Ford Mustang BOSS 429 - sold for $151,250 According to its Deluxe Marti Report, this Boss 429 was assigned KK 429 NASCAR production number 1335 and completed ahead of schedule on February 13, 1969. Today, it clearly continues to benefit from a high-quality, ground-up restoration dating to 2004/2005 and features a correct and highly detailed engine bay with the correct emissions-control equipment in place. Finished in Wimbledon White with a black deluxe interior, it includes all exp... more
Gallery: RM Auctions 2010 Collector Cars of Fort Lauderdale

1969 Ford Mustang Boss 429 Fastback 429/375 HP, 4-Speed - sold for $280,000 KK #1661. 429/375 HP engine. 4-speed transmission. Red with Black interior. Goodyear polyglas tires
Gallery: 2011 Monterey Daytime Auction by Mecum

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