10. Buick GSX
The 1970 model year was a watershed year for American muscle and performance models. Never have there been so many great models available. And thanks to steady sales and the great reception of their muscle models, Buick unveiled the ultimate muscle car. It was in the form of the legendary and scarce Buick GSX. The GSX stood for Gran Sport Experimental. And it was the visually upgraded Gran Sport with a 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 a front and rear spoiler and functioning hood scoops. It also had side stripes and Rally wheels.
The power output was the same at 345 HP/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. However, despite all the qualities of the GSX and numerous accolades by the motoring press, Buick built less than 700. Unfortunately, the GSX package added $1,100 over the price of a regular GS 455. So, this price boost proved to be too expensive for most buyers. So although the GSX option was available in 1971 and 1972, Buick produced them in even smaller numbers.