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Duntov laid out three design concepts that took decades to implement. The first was his proposal for the 1957 Q-Corvette. This design called for the following: an all-aluminum, fuel-injected small-block engine, four-wheel independent suspension, four-wheel disc brakes, and a transaxle. This design concept arrived in 1997 as the C5.
Somewhere in the second part of 1959, project XP-720 begins at GM Styling, to design a production Corvette based on Bill Mitchell's Sting Ray racer. It would become known as the C2 or second generation Corvette. In October of that same year, a clay mock-up of project XP-720 is completed and put on display for General Motors' management viewing.