17. Buick GSX
The 1970 model year was a watershed year for American muscle and performance models because there were so many great models available. Backed by steady sales and the great reception of their muscle models, Buick decided to introduce the ultimate muscle car in the form of the legendary and scarce Buick GSX. The GSX stood for Gran Sport Experimental and it was, in fact, a visually upgraded Gran Sport with the Stage 1 performance package.
The GSX debuted in 1970 with an aggressive graphics package not typical for Buick products. It was available in two bright colors, Saturn Yellow and Apollo White. Also, it came with front and rear spoilers, functioning hood scoops, side stripes, and Rally wheels. The power output was the same at 345 HP and 510 lb-ft. But, because the Buick 455 was significantly lighter than the Chevelle 454 or Plymouth Hemi 426, the GSX was a sure winner in street races all across America.
Sadly, despite all the qualities of the GSX and numerous accolades from the motoring press, Buick built less than 700 examples. Simply, the GSX package added $1,100 over the price of a regular GS 455. And this proved to be too expensive for most buyers. The GSX option was available in 1971 and 1972, but they produced those model years in even smaller numbers.