Mercedes-Benz M156 specs: 102.2 x 94.6 mm (4.0236 x 3.7244 in) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 378.8 ci |
|---|---|
| Cylinders | 8 |
| Bore | 4.024" |
| Stroke | 3.724" |
| Compression | 11.3:1 |
| Advertised power | 451–510 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| M156 E63 | 378.8 ci | 4.0236" × 3.7244" | 11.3:1 | 451–510 |
This family is represented by a single engine in the database: 378.8 ci, 8 cylinders, a 4.0236" × 3.7244" bore and stroke.
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.