Pontiac Firebird SD, Buick Grand National GNX, Mustang 5.0­-highlights of the muscle flexed in ’70s and ’80s Detroit{vsig}2008-5_2168{/vsig}The American collectible car contingent has long argued over when the “real” cars stopped rolling out of Detroit. Collectible prices indicate Detroit’s muscle atrophied with astonishing speed after 1971. What followed was a […]

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