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Chrysler 392ci specs: 392 ci (6.4L) 8-cylinder, 4.09 x 3.72 in (103.9 x 94.5 mm) bore and stroke, 10.9:1 compression. Rated 380-413 hp, 2011–2019. OHV.
The Chrysler 392ci is oversquare — the 4.09" bore exceeds the 3.72" stroke by 9.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.72" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. A rod ratio of 1.667 is in the range most production engines fall in. Each of the 8 cylinders displaces 49.0 ci (803 cc).
10.9:1 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 5 engines in the Chrysler 392ci family, all of them 392 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated from 380 to 413 hp across 2011–2019.
| Displacement | 392 ci / 6.4 L |
|---|---|
| Bore | 4.09" |
| Stroke | 3.72" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 10.9:1 |
| Rod length | 6.2" |
| Rod ratio | 1.667 |
| Bore/stroke ratio | 1.099 |
| Piston deck clearance | 0.01" |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 380–413 hp |
| Years | 2011–2019 |
| Bore/stroke character | 1.099 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,720 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.667 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 49.0 ci |
| Static compression | 10.9:1 — in the range that usually runs on pump premium |
| Intake valve diameter | 2.144" |
|---|---|
| Exhaust valve diameter | 1.659" |
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 |
|---|---|---|
| 2011 | 380 hp | — |
| 2012 | 380 hp | — |
| 2013 | 380 hp | — |
| 2019 | 413 hp | — |