Over the years, they evolved. The T-bird got bigger and clunkier and ultimately became a garden variety coupe until Ford retired the name.
Meanwhile, the Vette hung in there. It too got bigger and more sophisticated, more expensive and uncomfortable.
Times change. Ford has brought back the T-bird in a version that sort of recaptures the early spirit.
And General Motors may add a second more powerful Corvette model to challenge the European super cars.
The Corvette name has such strong brand appeal that it makes sense to build on it.
The trick is to do it sensibly and responsibly.