The Ford 427 was named for a racing displacement limit rather than its true 425.98-cubic-inch size, and it earned its reputation the hard way, winning Le Mans outright in 1966 and 1967 inside the GT40, and dominating NHRA Super Stock in the Ford Thunderbolt. Ford’s single-cam Cammer variant made 616 horsepower and was so dominant that NASCAR banned it before it ever raced. Few engines in Detroit history combined that much racetrack success with that much controversy.