The first straight-six internal combustion engine design, produced by Spyker in 1903, led to widespread usage of similar designs over the following years. While V8 power would eventually dominate the muscle car era, many popular cars of the time, including the first Ford Mustang offering, were powered by straight-six-cylinder engine layouts. Between the Chrysler Slant-6 and AMC Inline-6 straight-six-cylinder engines, the Slant-6 was the first to market, with a 170 cubic-inch variant available in the 1960 Plymouth Valiant. The
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