Chevrolet Cosworth Vega

Now here's something you don't see everyday. Built for only two model years (1975 and 1976), the Cosworth Vega perhaps represents the American car industries greatest foiled opportunity. Had it succeeded, American cars might have advanced to their current level years earlier.

Its twin-cam engine was revolutionary for American cars in 1975; Saturns of the early 1990's still advertised it as a big feature, to give you an idea.