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The Riviera was radically redesigned for the 1971 model year with flowing and dramatic "boat-tail" styling. Designed under Bill Mitchell's direction, it was penned by Jerry Hirshberg, future head of design for Nissan, mating the two-piece vee-butted:792 fastback rear window, inspired by the 1963 Corvette Sting Ray coupe, to the Riviera's platform.
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The 455 engine had a lower compression ratio to meet EPA emissions requirements, reducing power to 255 hp (190 kW), with 265 hp (198 kW) in the Gran Sport.
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One noteworthy advance was Buick's Max Trac limited-slip differential.