DeVilles had all of the same features as Calais models, plus dual rear cigarette lighters, Two-Way horizontal control front seat adjusters and rear center arm rest in all models except convertibles. Exterior distinction came from a DeVille script above the rear end of the belt molding and from the use of long, rectangular backup light lenses set into the lower rear bumper, as opposed to the smaller, square lenses used on Calais.
A new feature seen this year was a body color border around the edges of the vinyl top covering, when this option was ordered. This treatment had first been seen on 1969 Fleetwoods. The Sedan DeVille and Convertible DeVille were in their last season.
| Vehicle identification numbers were stamped on the top of the instrument panel this year and were visible through the windshield |
| The first symbol was a "6" for Cadillac |
| The second and third symbols correspond to the same symbols in the series code number |
| The fourth and fifth symbols correspond to the last two symbols in the standard Fisher Body Division code (Style Number without letter suffix) |
| The Sixth symbol was an "0" for 1970 model year |
The seventh symbol was an assembly plant code as follows:
|
| The next group of six numbers was the sequential unit production code |
| The number sequence began with 100001 at each assembly plant |
| Body Style Numbers, on the vehicle data plate (located on firewall) were prefixed with "70" for 1970 and suffixed with a single letter, which also indicated series and model and corresponds to the letter on the charts below |
| Model No. | Style Number | Body Type | Seating | Factory Price | Shipping Weight | Production Total |
|---|---|---|---|---|---|---|
| 70-683 | 68369L |
4-door Sedan DeVille | 6 | $6118 | 2132 kg | 7,230 |
| 70-683 | 68347J |
2-door Coupe DeVille | 6 | $5884 | 2114 kg | 76,043 |
| 70-683 | 68349B |
4-door Sedan DeVille | 6 | $6118 | 2148 kg | 83,274 |
| 70-683 | 68367F |
2-door Convertible DeVille | 6 | 6068 | 4660 | 15,172 |
| Engine type | Overhead valves |
| Block | Cast iron block |
| Bearings | Five main bearings |
| Valve Lifters | Hydraulic valve lifters |
| Displacement | 7.7 Litres |
| Bore and stroke | 109.2mm x 103.1mm |
| Compression ratio | 10.0:1 |
| Brake horsepower | 375 hp @ 4400 rpm |
| Power | 280 kW @ 4400 rpm |
| Torque | 525 ft. lbs @ 3000 rpm |
| Torque | 712 Nm @ 3000 rpm |
| Oil pressure | 35-40 psi |
| Carburetor | Rochester four-barrel Quadrajet Model 4MV |
| Wheelbase | 3289mm |
| Overall length | 5715mm |
| Tires | L-78x15 |
| Fuel tank | 26 gal(US) |