Ford 400ci specs: 4.00 x 4.00 in (101.6 x 101.6 mm) bore and stroke, shared by all 9 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 400 ci |
|---|---|
| Cylinders | 8 |
| Bore | 4.000" |
| Stroke | 4.000" |
| Compression | 7.3–9.2:1 |
| Advertised power | 149–260 hp |
| Years | 1971–1982 |
| Cylinder head data | 5 of 9 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Ford 400ci · 4.000" × 4.000" · 9.19:1 | 400 ci | 4" × 4" | 9.19:1 | 163–171 |
| 1974 400 170HP | 400 ci | 4" × 4" | 9.192:1 | 170 |
| Ford 400ci · 4.000" × 4.000" · 9.172:1 | 400 ci | 4" × 4" | 9.172:1 | 158–180 |
| 1977 400 173HP | 400 ci | 4" × 4" | 7.772:1 | 173 |
| 1978 400 160HP | 400 ci | 4" × 4" | 7.332:1 | 160 |
| 400 2V | 400 ci | 4" × 4" | — | 169 |
| 400 V-8 | 400 ci | 4" × 4" | — | 149–169 |
| S | 400 ci | 4" × 4" | — | 172–260 |
| S-code | 400 ci | 4" × 4" | — | 166–172 |
Compression spans 7.332:1 to 9.192:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
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.