The 1978 Cutlass was downsized to the new version of GM's A-body with a shorter, 108-inch (2,743 mm) wheelbase. This Cutlass was lighter than earlier versions at around 3,300 pounds (1,500 kg), and it could be ordered with any of several engines built by GM's different divisions; a Buick 231 V6, Oldsmobile 260 V8, Pontiac 301 V8 or Chevrolet 305 V8s with either 2 or 4 barrel carburetors.
The '78 Cutlass lineup included the Salon and Salon Brougham fastback coupes and sedans and the formal roof Supreme, Supreme Brougham and Calais coupes. The Salons were styled more like imported hatchbacks than racy fastbacks (although they had a separate trunk), and they quickly proved to be far less popular than the notchback Supreme and Calais coupes. There were also 2-seat (6 passenger) Cutlass Cruiser and Cutlass Cruiser Brougham station wagons; both being smaller, more conventional replacements of the 3-seat (8 passenger) Vista Cruiser. Broughams featured softer, quieter rides, and fancier trim and upholstery. A factory T-top was optional on notchback coupes only. The 4-4-2 appearance and handling package, available on Salon coupes, featured large lower body stripes and 4-4-2 decals outside but not always shown with decals, unique 4-4-2 seats and badges inside, and a taut performance suspension featuring quicker-ratio steering, heavier springs, stiffer shocks, a stiffer front stabilizer bar, a rear stabilizer bar, and bigger tires. The Cutlass Calais used essentially the same suspension as the 4-4-2, but it also came standard with several other performance and touring options, including full instrumentation, an aluminum spoked sport steering wheel, reclining front bucket seats and a center console with floor shifter. Cosmetically, the 1978 line continued through 1979 with only slight changes front and rear.
Source: Wikipedia, 2012