Buick Riviera GS
The Riviera was born in 1963 and immediately became one of the most exciting cars on the American market. The combination of elegant styling, a modern interior, and Buick`s Nailhead engine made the Riviera an instant best-seller. It was the first real competitor to the famous Ford Thunderbird. But Buick wanted more, and they introduced the legendary Riviera Gran Sport or GS in 1965 (via Hemmings).
The car featured a revised suspension, a bigger 425 engine, and a host of other performance upgrades. In this version, the Rivera was a true world-class automobile with 360 HP and acceleration times of 7.9 seconds. That was better than most of the sports cars of the period. The Riviera as a model stayed in production until 1993, the first three generations, especially the GS models, remained the most sought-after as some of the best luxury muscle cars Detroit ever produced.