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Jeep Hemi 5.7 specs: 345 ci (5.7L) 8-cylinder, 3.917 x 3.579 in (99.5 x 90.9 mm) bore and stroke. Rated 330 hp, 2005–2008. Used in the Jeep Grand Cherokee.
The Jeep Hemi 5.7 is oversquare — the 3.9173" bore exceeds the 3.5787" stroke by 9.5% — 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 43.1 ci (707 cc).
It is one of 8 engines in the HEMI family, the smallest at 345 ci. 4 factory variants share these dimensions, rated at 330 hp across 2005–2008.
| Displacement | 345 ci / 5.7 L |
|---|---|
| Bore | 3.9173" |
| Stroke | 3.5787" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.095 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 330 hp |
| Years | 2005–2008 |
| Bore/stroke character | 1.095 — 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 | 43.1 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 |
|---|---|---|
| 2005 | 330 hp | Hemi 5.7 |
| 2006 | 330 hp | Hemi 5.7 |
| 2007 | 330 hp | Hemi 5.7 |
| 2008 | 330 hp | Hemi 5.7 |