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6 in 1,361 mm 1991—93: 52.

The tamer-looking Riviera was no lighter, and its standard 455 V8 lost more power, dropping to 230 hp 172 kW and 245 hp 183 kW for standard and Stage One models respectively.

7 in 1,821 mm 1991—93: 73.

The CRT controlled the vehicle's climate control system and stereo, and also supplied advanced instrumentation such as a and maintenance reminder feature.

Hidden wiper arms made their debut.

As ' first entry into the personal luxury car market segment, the Riviera was highly praised by automotive journalists upon its high-profile debut.

It was a ground-up design on a new debuting for the 1963 model year and was also Buick's first unique Riviera model.

The 1972 Riviera also featured a redesigned ventilation system, and the 455 engine switched to net power ratings, 225 hp 168 kW or 250 hp 186 kW in the Gran Sport, although the actual drop in net power was only 5 hp 4 kW.

The engine was upgraded to the previously optional 340 hp 254 kW 425 cu in 7.