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Chrysler Hemi 5.7 specs: 345 ci (5.7L) 8-cylinder, 3.92 x 3.58 in (99.6 x 90.9 mm) bore and stroke. Rated 340-363 hp, 2005–2023. Used in the Chrysler 300.
The Chrysler Hemi 5.7 is oversquare — the 3.92" bore exceeds the 3.58" stroke by 9.5% — a layout that favors airflow and RPM over leverage at the crank. The 3.58" 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. A rod ratio of 1.746 is in the range most production engines fall in. Each of the 8 cylinders displaces 43.1 ci (707 cc).
It is one of 3 engines in the Chrysler 345ci family, all of them 345 ci — the differences between them are in compression, heads and rating, not displacement. 19 factory variants share these dimensions, rated from 340 to 363 hp across 2005–2023.
| Displacement | 345 ci / 5.7 L |
|---|---|
| Bore | 3.92" |
| Stroke | 3.58" |
| Cylinders | 8 |
| Configuration | V8 |
| Rod length | 6.25" |
| Rod ratio | 1.746 |
| Bore/stroke ratio | 1.095 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 340–363 hp |
| Years | 2005–2023 |
| Bore/stroke character | 1.095 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,580 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.746 — moderate — the range most production V8s fall in |
| 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 | 340 hp | Hemi 5.7 |
| 2006 | 340 hp | Hemi 5.7 |
| 2007 | 340 hp | Hemi 5.7 |
| 2008 | 340 hp | Hemi 5.7 |
| 2009 | 360 hp | Hemi 5.7 |
| 2010 | 360 hp | Hemi 5.7 |
| 2011 | 363 hp | Hemi 5.7 |
| 2012 | 363 hp | Hemi 5.7 |
| 2013 | 363 hp | Hemi 5.7 |
| 2014 | 363 hp | Hemi 5.7 |
| 2015 | 363 hp | Hemi 5.7 |
| 2016 | 363 hp | Hemi 5.7 |
| 2017 | 363 hp | Hemi 5.7 |
| 2018 | 363 hp | Hemi 5.7 |
| 2019 | 363 hp | Hemi 5.7 |
| 2020 | 363 hp | Hemi 5.7 |
| 2021 | 363 hp | Hemi 5.7 |
| 2022 | 363 hp | Hemi 5.7 |
| 2023 | 363 hp | Hemi 5.7 |