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The details on the 1970 Buick GS Stage 1 cars are well known. GM finally lifted its corporate ban on engines larger than 400 cubic inches in an intermediate body, and Buick responded by stuffing a 455-cubic-inch engine into the restyled GS. The 455 featured standard cold air induction through functional hood scoops, and was notably more powerful than the 400 it replaced. But if that wasn't enough, the Stage 1 package brought an even bigger cam, bigger valves, and a revised carburetor. Buick said all this work amounted to 360 horsepower but in reality, most testers believed that that number to be somewhere north of 400. Then there’s the astonishing 510 lb-ft. of torque, a number surpassed by only a handful of GM products, past or present. At the time, Motor Trend magazine declared that the GS Stage 1 was, “the quickest American production car we’ve ever tested.”
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