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Originally Posted by KidJavelin
Well, how about this for a start on a definition...
V8 powered vehicle manufactured between 1955 and 1972.
Pony cars would be a sub-class, full size cars another sub class, V8 sports cars still another sub-class. 
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That's a very vague definition. Not all V8 powered cars made during those years were in the muscle car class.
I consider Road and Track magazine to be a reliable source since they were around during the muscle era. I hope the following will put this debate to rest because I got this info from Road and Track magazine:
Road & Track identified the following models as "musclecars" in 1965:
1964-1965 Pontiac Tempest Le Mans GTO
1965-1975 Buick Riviera Gran Sport
1965-1969 Buick Skylark Gran Sport
1965-1970 Dodge Coronet/Plymouth Belvedere 426-S
1965 Chevrolet Chevelle Malibu SS
1965-1967 Oldsmobile Cutlass 442
Other later muscle cars include the following:
1970-1974 Buick GSX
Chevrolet Chevelle SS
1966-1974 Dodge Charger
1969-1970 Dodge Daytona
1971 Dodge Super Bee
Ford Fairlane (GT & Cobra)
1968-1974 Ford Torino (GT & Cobra)
1968-1971 Oldsmobile 442
Plymouth GTX
1968-1974 Plymouth Road Runner
1970 Plymouth Superbird
1966-1971 Pontiac GTO
Muscle cars are high-performance (4-wheeled motor vehicle; usually propelled by an internal
combustion engine) automobiles made primarily in (The largest city in Michigan and a major Great Lakes port;
center of the United States automobile industry; located in southeastern Michigan on the Detroit river across from Windsor)
Detroit from 1964 to 1974. Car manufacturers placed large V8 engines in
mid-sized cars, giving them quite startling performance and setting off intense competition between manufacturers to produce
the most powerful and extreme machine. The 1973 (An organization of countries formed in 1961 to agree on a common policy for
the production and sale of petroleum) OPEC oil embargo, stricter (Pollution of the atmosphere) air pollution laws and
(Promise of reimbursement in the case of loss; paid to people or companies so concerned about hazards that they have made
prepayments to an insurance company) insurance premiums killed most muscle car models, though they are actively collected
and restored.
Although auto makers such as Chrysler had occasionally experimented with placing a high performance V-8 in a lighter
mid-size platform, and full-size cars such as the Ford Galaxie and Chevrolet Impala had high-performance models,
Pontiac usually gets credit for starting the muscle car trend with its Pontiac GTO, based on the rather more
pedestrian Pontiac Tempest. Spearheaded by Pontiac division president John De Lorean, the GTO proved far more popular
than expected, and inspired a host of imitations and a general trend towards performance, both in the true 'muscle car'
class of intermediate vehicles, and also the smaller pony cars like the Ford Mustang,Plymouth Barracuda and AMC AMX, and
more luxurious and expensive vehicles such as the Buick Riviera.
However, a large part of the appeal behind muscle cars was that they were mostly inexpensive models young drivers could
afford. For instance, Chevrolet placed an extremely large 396 cubic inch (6.5 Liter) engine in its compact Nova. In today's
terms this would be equivalent to attempting to make a Chevy Prizm with a Corvette motor (though the performance gains would
be vastly different in such a project today as smaller, modern engines can use newer technology to produce vastly more power
than their same-sized counterparts from the muscle car era). Mopar also had several low-cost models, such as the Dodge Super
Bee and Plymouth Road Runner.
Between 1964 and 1970, Detroit auto makers were in competition for the bragging rights to the most powerful motor. Power
numbers generally hit their peak in 1970; the Chevelle SS 454 from that year is generally considered to have had the highes
t advertised output, producing 450 horsepower (336 kW) from a 454 cubic inch (7.4 Liter) engine. By 1971, muscle cars began
to fall out of favor and disappear, with one of the last muscle car holdouts being Pontiac's Trans Am 1973 and 1974 SD455
model (while the SD455 was considered the last muscle car, the Trans Am nameplate continued until 2002).
While fast (sometimes extremely fast) in a straight line, most had primitive brakes and suspension (compared with modern
vehicles and also European sports cars of the time), and tires which were inadequate to handle the acceleration and speeds
the engines made capable. These inadequacies have all been to some degree addressed by after-market suppliers, of course.
(end)
If you argue with Road and Track then you are an idiot, how can anyone know more about cars then a magazine that has been test driving/researching them for over 40 years.
A side note: The insurance companies determined what was a muscle car by its weight to advertised horsepower ratio. Now days they don't call them "muscle cars" they call them "high performance cars".