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Mercedes-Benz M156 E63 specs: 6.2L (378.8 ci) 8-cylinder, 102.2 x 94.6 mm (4.0236 x 3.7244 in) bore and stroke, 11.3:1 compression. Rated 451-510 hp. DOHC.
The Mercedes-Benz M156 E63 is oversquare — the 4.0236" bore exceeds the 3.7244" stroke by 8.0% — a layout that favors airflow and RPM over leverage at the crank. The 3.7244" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 47.4 ci (776 cc).
11.3:1 on aluminum heads is high enough that pump premium or better is normally required.
5 factory variants share these dimensions, rated from 451 to 510 hp. Factory fitments include the Mercedes-Benz C63 AMG (W204), Mercedes-Benz CLK63 AMG (C209), Mercedes-Benz CLS63 AMG (C219) and 10 others.
| Displacement | 378.8 ci / 6.2 L |
|---|---|
| Bore | 4.0236" |
| Stroke | 3.7244" |
| Cylinders | 8 |
| Compression ratio | 11.3:1 |
| Bore/stroke ratio | 1.08 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 451–510 hp |
| Bore/stroke character | 1.080 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,724 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 47.4 ci |
| Static compression | 11.3:1 — high enough that pump premium or better is normally required |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 451 hp | M156 E63 |
| — | 480 hp | M156 E63 |
| — | 487 hp | M156 E63 |
| — | 500 hp | M156 E63 |
| — | 510 hp | M156 E63 |