The 1964 GTO put a 389-cubic-inch V8 into Pontiac’s intermediate Tempest line as an option package. Its significance is the combination: a familiar-sized car with a much bigger performance identity. We choose this original model year rather than treating every later GTO as the same car.
It beats the Hemi ’Cuda because our first priority is influence on the muscle-car idea, not the most dramatic engine. That does not mean it invented powerful American cars. Prefer engineering spectacle and Plymouth can win instead. Which deserves first place: the blueprint or the peak?
Sources: GM history.
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