Auctions America Auburn Fall Spotlight: 1969 Ford Mustang Boss 429 Drag Car

By Auto News Log • July 31st, 2012

Built to homologate the new 429 “semi-hemi” engine for NASCAR, the Boss 429 was the most powerful Mustang ever and one of the rarest as well. The engine, intentionally under-rated at a humble 375 horsepower, featured a forged steel crank, NASCAR rods, four-bolt main bearing caps and large-valve aluminum heads with crescent-shaped combustion chambers. A large cold air scoop fed a huge Holley carburetor atop an aluminum high-rise intake manifold; breathing was controlled by a hydraulic cam that was replaced partway through production with an improved solid-lifter version. All 429’s were equipped with power steering and brakes with front discs, a Hurst-shifted four-speed and 3.91:1 Traction-Lok rear end.

The collector car world will celebrate one of its longest running automotive traditions during the upcoming Labor Day weekend when thousands flock to Auburn, Ind., for Auctions America by RM’s third annual Auburn Fall auction, Thursday, Aug. 30, to Sunday, Sept. 2. More than 1,200 classics, hot rods, exotics, muscle cars and more, each carefully-reviewed by America’s leading collector car experts, will cross the block at the historic Auburn Auction Park.

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