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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, 12.7:1 compression. Rated 305 hp, 2009–2010. 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 1.732 is in the range most production engines fall in. Each of the 8 cylinders displaces 43.1 ci (707 cc).
12.7:1 on iron heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
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. 2 factory variants share these dimensions, rated at 305 hp across 2009–2010.
| Displacement | 345 ci / 5.7 L |
|---|---|
| Bore | 3.92" |
| Stroke | 3.58" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 12.7:1 |
| Rod length | 6.2" |
| Rod ratio | 1.732 |
| Bore/stroke ratio | 1.095 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 305 hp |
| Years | 2009–2010 |
| 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 | 1.732 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 43.1 ci |
| Static compression | 12.7:1 — high enough that pump premium or better is normally required |
| Intake valve diameter | 2.1" |
|---|---|
| Exhaust valve diameter | 1.6" |
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 |
|---|---|---|
| 2009 | 305 hp | — |
| 2010 | 305 hp | — |