Shelby 428ci specs: 105 x 101.2 mm (4.1320 x 3.9840 in) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings.
| Displacement | 428 ci |
|---|---|
| Cylinders | 8 |
| Bore | 4.132" |
| Stroke | 3.984" |
| Compression | 11.6–12.3:1 |
| Advertised power | 335–390 hp |
| Years | 1967–1968 |
| Cylinder head data | 2 of 2 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Shelby 428ci · 4.132" × 3.984" · 12.25:1 | 428 ci | 4.132" × 3.984" | 12.25:1 | 390 |
| Shelby 428ci · 4.132" × 3.984" · 11.6:1 | 428 ci | 4.132" × 3.984" | 11.6:1 | 335 |
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.