When Ford wanted to use a new engine in NASCAR, to qualify it was required to build 500 production cars. Instead of putting their new 429ci (7.2-liter) into the mid-sized Torinos which they were racing, they decided to shoehorn it into the Mustang. The 429 motor was unlike any other Ford motor, being much wider in the cylinder head, thanks to its semi-Henri' combustion chamber design. It meant the Mustang strut towers had to be widened and the battery moved to the trunk. The Boss used a the 'Top Loader' close-ratio, four-speed manual transmission because the autos couldn't handle the power. Modified suspension comprised uprated springs, anti-roll bar and re-valved shocks. The Boss 429 was the most expensive non-Shelby Mustang ever to be produced, but nonetheless the 428 Cobra Jet version was the fun on the street.
Ford Mustang Boss 429 Specifications
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