The 421 Super Duty engine was introduced at the end of the '61 model year. Basically an enlarged 389 Super Duty, the components were shipped to factory-backed racers to make Pontiac an even greater on ...
In 1961, Pontiac did a number on its Detroit-wide rivals and put out the 421-cubic-inch Super Duty V8. The 6.9-liter motor became the name to beat at the track and strip, so in 1962, the National Hot ...
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