Side trim on the long-wheelbase Fleetwood models was about the same as 1955, except for the addition of exhaust extension moldings on the rear fender. This trim ran along a tapering conical flare from above the wheel housing to the rear bumper. A Fleetwood script appeared on the deck lid and limousine styling was seen again. Changes in grilles and bumpers conformed to those used with other series. Both models had auxiliary seats and the Imperial sedan again featured a glass driver's partition. Standard equipment on all Cadillacs was comparable to that included the previous year.
1956 Cadillac Coupe DeVille
| Model Number | Body Style | Doors | Model | Seat | Price | Weight | Production Total |
|---|---|---|---|---|---|---|---|
| 55-75 | 7523X | 4-door | Sedan | 7 | $6558 | 2295 kg | 1095 |
| 55-75 | 7533X | Imperial Sedan | 8 | $6773 | 2332 kg | 955 | |
| 55-86 | 8680S | Commercial chassis | 2,025 |
NOTE: The commercial chassis featured a 4013mm wheelbase and was provided to makers of professional cars for construction of funeral cars and ambulances, etc.
| Feature | Standard Engine | Optional Engine |
| Type | V-8: Overhead valves | V-8: Overhead valves |
| Block | Cast iron block | Cast iron block |
| Displacement | 5.972 Liters | 5.972 Liters |
| Bore and stroke | 101.6mm x 92.1mm | 101.6mm x 92.1mm |
| Compression ratio | 9.75:1 | 9.75:1 |
| Horsepower rating | 285 hp @ 4600 rpm | 305 hp @ 4700 rpm |
| Power rating | 213 kW @ 4600 rpm | 227 kW @ 4700 rpm |
| Main bearings | Five | Five |
| Valve lifters | Hydraulic | Hydraulic |
| Carburetor | Carter WCFB four-barrel, Model 2370S | Two (2) Carter WCFB four-barrel, Model 2371S |
| Feature | Series 75 Fleetwood |
| Wheelbase | 3804mm |
| Overall Length | 5987mm |
| Front Tread | 1524mm |
| Rear Tread | 1603mm |
| Tires | 8.20 x 15 Blackwall |
| Exhaust | Dual exhaust |
1955