

Interior trim was upgraded from LeSabres with a notchback bench seat including center armrest standard equipment along with more luxurious cloth-and-vinyl or all-vinyl upholstery. What also separated the car from the LeSabre was that when the car would be ordered or recognized as a Centurion it would be branded as a 4P Series as the first two letters of the Vehicle Identification Number. This was known as the A9 and B6 Option when ordering the car.
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The Centurion was also offered in the 455 Stage 1 and manual transmission configuration as well during the early portion of the 1971 model year, shared with the Buick GSX. The Centurion was offered initially with only the 455-cubic-inch (7.5 L) big-block V8 in two power output ranges determined by the presence of either a single or dual exhaust. Replacing the Wildcat as the mid-line full-sized Buick positioned between the lower-priced LeSabre and the larger and more luxurious C-body Electra 225, the Centurion was promoted more as a mid-level luxury car than the Wildcat, which was marketed as a sporty/luxury performance car. The Centurion shared a trim package implementation shared with the Chevrolet Caprice, Pontiac Grand Ville and the Oldsmobile Delta 88 Royale as a hardtop coupe, sedan and convertible.

The car's emblem was not the traditional Buick tri-shield, but a side profile of a centurion. The Centurion name was inspired by a Buick concept car, the name coming from that of an officer in the Roman Army. Replacing the Wildcat as the sporty iteration of Buick's three full-size car lines, it was positioned between the LeSabre and Electra in the lineup. The Buick Centurion is a full-size car built from the 1971 through 1973 model years. Wilmington, Delaware, USA ( Wilmington Assembly) South Gate, California, USA ( South Gate Assembly) Kansas City, Kansas, USA ( Fairfax Assembly)
