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7 best American muscle cars of all time

1970 Buick GSX Stage 1
1970 Buick GSX Stage 1

When Buick entered the muscle-car market, it was among the most luxurious of the brands, and some of the most powerful.

The GSX appearance package, first available for the 1970 Gran Sport 455, abandoned Buick's traditional, more dignified branding with a rear spoiler and body striping. Of the 687 GSXs built, 488 were ordered with the Stage 1 upgrade, according to HowStuffWorks.com.

First appearing as an option on the 1965 Skylark, Gran Sport became a separate nameplate in 1967. By 1970, a 455-cubic-inch V-8 engine powered the Gran Sport. It produced a hefty 510 pounds-foot of torque. Those with Stage 1 tuning and engine tweaks delivered 360 horsepower to the rear wheels. There were quicker competitors, but the GSX truly was unique.

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