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Dodge ESF specs: 370 ci (6.1L) 8-cylinder, 4.055 x 3.579 in (103 x 90.9 mm) bore and stroke. Rated 425 hp, 2006–2010. Used in the Dodge Charger. OHV.
The Dodge Gen III Hemi (ESF) 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).
It is one of 16 engines in the Gen III Hemi family, sitting between the 345 ci and 392 ci members. 5 factory variants share these dimensions, rated at 425 hp across 2006–2010.
| Displacement | 370 ci / 6.1 L |
|---|---|
| Bore | 4.0551" |
| Stroke | 3.5787" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.133 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 425 hp |
| Years | 2006–2010 |
| 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 |
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 |
|---|---|---|
| 2006 | 425 hp | ESF |
| 2007 | 425 hp | ESF |
| 2008 | 425 hp | ESF |
| 2009 | 425 hp | ESF |
| 2010 | 425 hp | ESF |