A 409-based 427 with trick heads, originally developed for NASCAR super speedways, laid the groundwork for the legendary 427 big-block.
In 1963, GM’s support of the absurd AMA racing ban stifled Chevrolet in its quest to dominate NASCAR & USAC stock car and NHRA drag racing. Quietly developed with help from Smokey Yunick, a super-409 displacing 427 cubic inches proved to be just what was needed. Chevrolet got it’s chance to hold off the competition until the ban was history and the “modern” Mark IV big block surfaced in 1965. After one shot, the Mystery Motor faded into obscurity.
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