The Chevelle SS is a high-performance version of the Chevrolet Chevelle, a mid-size car produced by General Motors from 1964 to 1977. The SS, or Super Sport, was introduced in 1964 and became known for its powerful engines and sporty design. It was available in various configurations, including coupes and convertibles, and gained popularity among muscle car enthusiasts. The Chevelle SS is particularly famous for its performance models from the late 1960s and early 1970s, which featured big-block V8 engines. These models are often sought after by collectors today, making the Chevelle SS a classic symbol of American muscle cars.