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Chrysler 345ci specs: 345 ci (5.7L) 8-cylinder, 3.92 x 3.58 in (99.6 x 90.9 mm) bore and stroke, 10.5:1 compression. Rated 300-345 hp, 2007–2013. OHV.
The Chrysler 345ci 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).
10.5:1 on iron heads is in the range that usually runs on pump premium; iron holds heat, so treat it as the less forgiving side of that range.
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. 6 factory variants share these dimensions, rated from 300 to 345 hp across 2007–2013.
| Displacement | 345 ci / 5.7 L |
|---|---|
| Bore | 3.92" |
| Stroke | 3.58" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 10.5:1 |
| Rod length | 6.25" |
| Rod ratio | 1.746 |
| Bore/stroke ratio | 1.095 |
| Piston deck clearance | 0" |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 300–345 hp |
| Years | 2007–2013 |
| 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 |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
| Intake valve diameter | 2" |
|---|---|
| Exhaust valve diameter | 1.55" |
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 |
|---|---|---|
| 2007 | 345 hp | — |
| 2009 | 300 hp | — |
| 2010 | 300 hp | — |
| 2011 | 300 hp | — |
| 2012 | 300 hp | — |
| 2013 | 300 hp | — |