The Buick and Oldsmobile 455-cubic-inch V-8 engines are separate powerplants produced by the two automakers under the General Motors umbrella. Each featured different bore and stroke dimensions and horsepower ratings. The two 455s were clearly Buick and Oldsmobile’s answer to the muscle car rate of the 1960s and early 1970s, but neither automaker received credit for producing performance street cars. Rather, Chevrolet’s more popular 454 and Chrysler’s 427 Hemi V-8s overshadowed the 455s.

Buick and Olds in the 1960s

Chevrolet’s Chevelle, El Camino and Camaro, and the Ford’s Mustang, Torinos and Mercury Cougar received the lion’s share of credit for producing performance cars. Rounding out the field were the Hemi-powered Dodge Chargers and Plymouth ‘Cudas. Chevys were equipped with the 396 and 454 V-8s, while Ford and Mercurys received the 351 and Boss 302.