The 1970 GSX was Buick's bold statement during the muscle car era. It not only looked the part, it also performed like a top-notch muscle car. The GSX was only available in 2 colours, yellow and white, which was combined with its distinctive stripe package. The GSX had its roots in the Gran Sport line of Buick™ performance cars, started in 1965 with the Skylark. Under the hood was a 455 cubic inch V-8 which supplied 510 lbs. of torque at a low 2,800 rpm. Needless to say, it had muscle car performance. Today the GSX is a very collectable car since only 678 cars were built.