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Chrysler SRT 6.4 / 392 specs: 392 ci (6.4L) 8-cylinder, 4.09 x 3.72 in (103.9 x 94.5 mm) bore and stroke. Rated 485 hp, 2023. Used in the Chrysler 300. OHV.
The Chrysler SRT 6.4 / 392 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).
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.
| Displacement | 392 ci / 6.4 L |
|---|---|
| Bore | 4.09" |
| Stroke | 3.72" |
| Cylinders | 8 |
| Configuration | V8 |
| Rod length | 6.2" |
| Rod ratio | 1.667 |
| Bore/stroke ratio | 1.099 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 485 hp |
| Years | 2023 |
| 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 |
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