Ford 255ci specs: 3.681 x 3.00 in (93.5 x 76.2 mm) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 255 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.681" |
| Stroke | 3.000" |
| Compression | 9.2:1 |
| Advertised power | 111–122 hp |
| Years | 1980–1982 |
| Cylinder head data | 1 of 3 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Ford 255ci · 3.681" × 3.000" · 9.212:1 | 255 ci | 3.681" × 3" | 9.212:1 | 111–122 |
| 4.2L V-8 | 255 ci | 3.681" × 3" | — | 115 |
| D-code | 255 ci | 3.681" × 3" | — | 119–120 |
All are oversquare — bore larger than stroke, which favours revs over low-end torque.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.