Ford 427ci specs: 4.232 x 3.784 in (107.5 x 96.1 mm) bore and stroke, shared by all 7 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 427 ci |
|---|---|
| Cylinders | 8 |
| Bore | 4.232" |
| Stroke | 3.784" |
| Compression | 10.9–14.0:1 |
| Advertised power | 390–425 hp |
| Years | 1963–1968 |
| Cylinder head data | 2 of 7 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| R-code | 427 ci | 4.232" × 3.784" | — | 425 |
| W-code | 427 ci | 4.232" × 3.784" | — | 410 |
| Q | 427 ci | 4.232" × 3.784" | — | 410 |
| R | 427 ci | 4.232" × 3.784" | — | 425 |
| W | 427 ci | 4.232" × 3.784" | — | 410 |
| Ford 427ci · 4.232" × 3.784" · 14:1 | 427 ci | 4.232" × 3.784" | 14:1 | 425 |
| Ford 427ci · 4.232" × 3.784" · 10.9:1 | 427 ci | 4.232" × 3.784" | 10.9:1 | 390 |
Compression spans 10.9:1 to 14:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
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.