Buick Gran Sport

The Gran Sport (also known as the GS) was a special version of the Buick Skylark. A "GSX" model was also offered later on. The GS name eventually became a trim for the Buick Regal, but unrelated to performance. The "Gran Sport" name had also been used as a special unrelated model of the Chevrolet Corvette.

Motorsport
The Gran Sport and GSX competed in stock car racing. Buick withdrew from NASCAR after the eighties, leaving later Buicks with the GS trim to be unusued in motorsport.