Only Bill Mitchell could get away with this. Bill always managed to have a hot daily ride. Engineering prototypes that weren't street-legal stayed behind the fence, but many of the show car Corvettes managed to go home with Bill. His usual statement on his "design study" cars was, "This thing runs like a bear!" For the Mulsanne Bill added, "This is the best Stingray ever."
In 1969, Chevrolet changed the perception of Corvette forever by introducing the ultra-powerful ZL-1 Corvette with a 427 CI engine producing 585 horsepower! The 1969 ZL-1 Corvette came equipped with an entirely new big-block engine option that produced more horsepower than any Corvette that had come before it. Any Corvette, when ordered with RPO ZL1, came fitted with an all-aluminum 427 C.I. engine that featured a dry-sump oil system and which weight approximately 100 pounds less.