Answer by
brians6000 (640)
Many say that the 1964 Pontiac GTO was the first true Muscle Car. Technically, a Muscle Car is a V8 powered Mid Size vehicle. True muscle cars were the GTO, Chevelle, Fairlane GT, Olds 442, Buick Skylark, Dodge Charger and many more. The muscle era declined in the 70s.