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Chrysler Hemi 6.1 SRT specs: 370 ci (6.1L) 8-cylinder, 4.055 x 3.58 in (103 x 90.9 mm) bore and stroke. Rated 420 hp, 2006–2010.
The Chrysler Hemi 6.1 SRT is oversquare — the 4.055" bore exceeds the 3.58" stroke by 13.3% — 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 1.732 is in the range most production engines fall in. Each of the 8 cylinders displaces 46.3 ci (758 cc).
It is one of 4 engines in the Chrysler 370ci family, all of them 370 ci — the differences between them are in compression, heads and rating, not displacement. 5 factory variants share these dimensions, rated at 420 hp across 2006–2010.
| Displacement | 370 ci / 6.1 L |
|---|---|
| Bore | 4.055" |
| Stroke | 3.58" |
| Cylinders | 8 |
| Configuration | V8 |
| Rod length | 6.2" |
| Rod ratio | 1.732 |
| Bore/stroke ratio | 1.133 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 420 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 | 3,580 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.732 — moderate — the range most production V8s fall in |
| 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 | 420 hp | Hemi 6.1 SRT |
| 2007 | 420 hp | Hemi 6.1 SRT |
| 2008 | 420 hp | Hemi 6.1 SRT |
| 2009 | 420 hp | Hemi 6.1 SRT |
| 2010 | 420 hp | Hemi 6.1 SRT |