"Buick was a performance player back in the muscle car days, with 455 cubic inch V-8s offered in the company's Gran Sport (GS) models," Brauer said. "The top dog was the 1970 Buick GSX with the 455 Stage 1 engine rated at 370 horsepower and 510 pound-feet of torque."
Only 400 of these GSXs were produced, so its relatively limited production run has kept it somewhat valuable among collectors and enthusiasts. Its current market value is $75,000.
