What is the difference between a Chevelle and a Chevelle SS?

The Chevelle is a mid-size car produced by Chevrolet from 1964 to 1977, available in various trims and configurations. The Chevelle SS (Super Sport) is a high-performance variant that features upgraded engines, suspension, and styling enhancements, making it more powerful and sporty than the standard Chevelle. While all Chevelle SS models are Chevelles, not all Chevelles are SS models; the SS designation signifies a focus on performance and sportiness.