[Erik Latranyi]

The original Mustang lasted from 64 1/2 to 68, with the 67-68 models being a fairly major revsion in themselves. The Chevelle had a 64-67 product cycle, the Corvette Stingray only lasted 4 years, the Original Camaro/Firebird only lasted for 3 model years.

The muscle car wars are an example of innovation due to competition. The rest of the lineups were stagnant and unchanging.

[RFT1]

Wrong again. The Ford Fairlane in the late 60s had a 3 year product cycle, just the 67-69 model years, the Chevy Impala/Caprice had a 4 year cycle. Also most Chevelles were not muscle cars, but the midsized GM car that people bought to go from point A to point B.