The Pontiac 421 Super Duty engine powered various muscle cars ... helped the 421 SD-powered Pontiacs dominate drag strips and NASCAR circuits in the early 1960s, making them legends among muscle ...

NASA’s tow vehicle of choice was pulled straight from the NASCAR paddock ... as high in the powerband as possible, at engine speeds where the Pontiac would live most of its life out in the ...

During the same period, NASCAR was also going to run the ... forced Pontiac to look for an alternative. Pontiac decided that the engine from its colleagues at Buick would be a great fit.