Here’s What Made The Pontiac 421 Super Duty Big Block Engine So Impressive

Pontiac made more than its share of classic muscle cars during the brand’s run from 1926 through 2009, including the classic Road Runner and GTO. Two Pontiac badges that don’t often get listed with the GTO, Firebird, and Trans Am in discussions of the brand’s most powerful models are the Catalina and the Ventura. For a few years, however, those two cars were outfitted with one of the beastliest engines in automotive history. In 1961, the super stock drag

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