There is one school of thought that the muscle car was born in 1964 when the Pontiac GTO was first introduced with a 389 CID 348 HP Tri-Power engine and a 4-speed manual transmission.
The most widely accepted definition of a Muscle car is a late 1960s and early 1970s American 2-door, rear wheel drive car that the average guy could afford. Although Australia, South Africa and the UK have also capitalized on the Muscle car phenomenon.
Every American car manufacturer has defined the concept from AMC AMX to the Ford Thunderbolt and the MOPAR Hemi powered death traps that bring the big bucks at auction.
Surviving muscle cars are now prized possessions and some of these which have been purchased for over a half million dollars are now just dust collectors for us to appraise like fine art.