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Chrysler 378ci (2021) · 700 hp specs: 378 ci (6.2L) 8-cylinder, 4.07 x 3.63 in (103.4 x 92.2 mm) bore and stroke, 12.5:1 compression. Rated 700 hp, 2021. OHV.
The Chrysler 378ci (2021) · 700 hp is oversquare — the 4.07" bore exceeds the 3.63" stroke by 12.1% — a layout that favors airflow and RPM over leverage at the crank. The 3.63" stroke puts mean piston speed at 4,000 ft/min around 6,600 RPM, which is where a production bottom end is generally considered at its limit. A rod ratio of 1.704 is in the range most production engines fall in. Each of the 8 cylinders displaces 47.3 ci (774 cc).
12.5:1 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 2 engines in the Chrysler 378ci family, all of them 378 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 378 ci / 6.2 L |
|---|---|
| Bore | 4.07" |
| Stroke | 3.63" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 12.5:1 |
| Rod length | 6.185" |
| Rod ratio | 1.704 |
| Bore/stroke ratio | 1.121 |
| Piston deck clearance | 0" |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 700 hp |
| Years | 2021 |
| Bore/stroke character | 1.121 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,630 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.704 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 47.3 ci |
| Static compression | 12.5:1 — high enough that pump premium or better is normally required |
| Intake valve diameter | 2.2" |
|---|---|
| Exhaust valve diameter | 1.68" |
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