Chevrolet Chevelle The Chevrolet Chevelle SS represented Chevrolet's entry into the hot midsize muscle car battle. The Chevelle SS was the high performance version of Chevrolet's Chevelle, and had its own line of engines and performance equipment. At first caught napping with just a 327 V8, the Chevelle SS would soon sport powerful 396 V8s and eventually the most powerful rated engine in muscle car history, the LS6 454 in 1970. The Chevelle, along with the Pontiac GTO, remains one of the most popular cars from this era and with good reason. Its strong performance at a reasonable price made it popular on the street and at the track. DIRECTORY OVERVIEW HISTORY PICTURES