For 1977, GM significantly downsized their full sized cars. The DeVille and Fleetwood Brougham rode on the same 121.5" wheelbase and were powered by the 425 cubic inch (7.0L) V8. This engine was basically a de-bored version of the 472/500 (7.9 L/8.2 L) V8 of previous years. Compared with the 1976 Fleetwood Sixty Special Brougham, the Fleetwood Brougham had a wheelbase 11.5" shorter and weighed nearly 900 lb (400 kg) less. The new Fleetwood Brougham, which had lost its exclusive longer wheelbase, was now virtually identical to the lesser Sedan de Ville. Other than the name, there were only subtle exterior differences between a Fleetwood Brougham and Sedan de Ville. The interior of the Fleetwood was more plush and offered more features as standard.