1971 Ford Mustang
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The Ford Mustang was successfully introduced in April 1964 as a sporty "Pony car" to attract younger buyers into Ford products. After only a few short years of development, Ford saw the need to create performance Mustangs to compete with GM and their release of the Chevrolet Camaro and Pontiac Firebird.
As popular as the Mustang was, it wasn't much of a street racer. However following the increased dimensions of the Mustang in 1967 and then again in 1969, larger and more powerful engines could be shoe-horned into the Mustangs engine bay. The Big Block 390 cu in (6.4 L) FE engine introduced in 1967, was a step in the right direction, but the 390 FE wasn't much of a match against the Chevrolet 396 cu in (6.5 L) V-8 in the Camaro or even the 400 cu in (6.6 L) V-8 in the Firebird. If you wanted a fast Mustang, you'd have to go to a much more expensive Shelby Mustang, which was equipped with the 428 cu in (7.0 L) FE engine.
Late in the 1968 model year, Ford introduced the 428 cu in (7.0 L) Cobra Jet FE engine in a small group of Mustang GTs and into the 1968 Shelby GT500KR. This was a strong performer and pointed to the direction that the 1969 Mustang would take. However, "GT" wasn't a name that would initiate images of street screeching performance. Ford decided upon the Mach 1, with the supersonic connotations.