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Dodge 6.1L Hemi specs: 370 ci (6.1L) 8-cylinder, 4.055 x 3.579 in (103 x 90.9 mm) bore and stroke, 10.3:1 compression. Rated 425 hp. OHV.
The Dodge 6.1L Hemi is oversquare — the 4.0551" bore exceeds the 3.5787" stroke by 13.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.5787" stroke puts mean piston speed at 4,000 ft/min around 6,700 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 46.3 ci (758 cc).
10.3:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 16 engines in the Gen III Hemi family, sitting between the 345 ci and 392 ci members. Factory fitments include the Dodge Charger SRT8, Chrysler 300C SRT8, Jeep Grand Cherokee SRT8 and 1 other.
| Displacement | 370 ci / 6.1 L |
|---|---|
| Bore | 4.0551" |
| Stroke | 3.5787" |
| Cylinders | 8 |
| Compression ratio | 10.3:1 |
| Bore/stroke ratio | 1.133 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 425 hp |
| Bore/stroke character | 1.133 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,579 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 46.3 ci |
| Static compression | 10.3:1 — in the range that usually runs on pump premium |
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