GM’s third production overhead-valve V-8 engine in five years, the Buick “nailhead” was the warmup act for the small-block Chevy, and a classic in its own right.

Roadmaster represented Buick's largest class of ... and the four-door Sedan. By ... The powerhouse for Supers in model years 1953 to 1956 was the 322 Nailhead, after which Buick moved on to a ...

Regardless of door numbers and roof styles, the Roadmasters of '57 had a 215-inch-long (5.5-meter) automobile and weighed anywhere from 4,500 to 4,900 lb (2,000 – 2,222 kg).