Hot Rod Magazine Dynos Smokey Yunick’s 1963 Chevy 427 Mystery Motor

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Photo Credit: Hot Rod Magazine Hot Rod Magazine recently celebrated the 50th anniversary of the big block Chevrolet Mark IV engine with a world-exclusive dyno test of one of the 427 Mystery Motors built by Smokey Yunick. The 427 Mark II Mystery Motor isn’t actually part of the legendary Mark IV family, which debuted in