Shelby 260ci specs: 96.5 x 72.9 mm (3.8000 x 2.8700 in) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings.
| Displacement | 260 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.800" |
| Stroke | 2.870" |
| Compression | 12.0:1 |
| Advertised power | 164–260 hp |
| Years | 1962–1964 |
| Cylinder head data | 1 of 3 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| F-code | 260 ci | 3.8" × 2.87" | — | 164 |
| Shelby 260ci (1963–1964) | 260 ci | 3.8" × 2.87" | — | 164 |
| Shelby 260ci · 3.8" × 2.87" · 12:1 | 260 ci | 3.8" × 2.87" | 12:1 | 260 |
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.