Pontiac poured on so much performance for '63 that only an order from the highest power could slow it down. Unfortunately, that's what happened with the 1963 Super Duty 421. Learn about this muscle car.
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"Muscle cars" are American automobiles with lots of power, modest weight, and blazing acceleration. The term was coined in 1964 when Pontiac introduced a potent 389-cubic-inch V-8 for a midsize car. The option turned a tame Tempest into a snarling GTO.