"All GM B-body full-size cars were completely restyled and enlarged for 1971, but continued to ride on a 124-inch (3,150 mm) wheelbase. It reached its maximum size in 1974 at an astounding 226.9-inch (5,763 mm) in length. It was available as a pillared four-door Town Sedan, two-door and four-door Holiday hardtops and a convertible...
Engine offerings again included 350 and 455-cubic-inch Rocket V8s ranging from 250 to 340 gross horsepower, all of which featured lowered compression ratios beginning in 1971 to enable use of lower octane regular leaded 91 RON octane, low-lead or unleaded gasoline. Vented power front disc brakes and variable-ratio power steering were now standard equipment on all 88 models. During the 1971 model year the Turbo Hydra-matic 400 transmission was added to the standard equipment list." Wikipedia