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Chrysler 378ci specs: 378 ci (6.2L) 8-cylinder, 4.09 x 3.58 in (103.9 x 90.9 mm) bore and stroke, 9.6:1 compression. Rated 600 hp, 2015–2017. OHV.
The Chrysler 378ci is oversquare — the 4.09" bore exceeds the 3.58" stroke by 14.2% — 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 47.3 ci (774 cc).
9.6:1 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 2 engines in the Chrysler 378ci family, all of them 378 ci — the differences between them are in compression, heads and rating, not displacement. 3 factory variants share these dimensions, rated at 600 hp across 2015–2017.
| Displacement | 378 ci / 6.2 L |
|---|---|
| Bore | 4.09" |
| Stroke | 3.58" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 9.6:1 |
| Rod length | 6.2" |
| Rod ratio | 1.732 |
| Bore/stroke ratio | 1.142 |
| Piston deck clearance | 0.018" |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 600 hp |
| Years | 2015–2017 |
| Bore/stroke character | 1.142 — 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 | 47.3 ci |
| Static compression | 9.6:1 — in the range that usually runs on pump premium |
| Intake valve diameter | 2.14" |
|---|---|
| Exhaust valve diameter | 1.66" |
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 |
|---|---|---|
| 2015 | 600 hp | — |
| 2016 | 600 hp | — |
| 2017 | 600 hp | — |