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Chrysler 392ci (2021) · 450 hp specs: 392 ci (6.4L) 8-cylinder, 4.09 x 3.73 in (103.9 x 94.7 mm) bore and stroke, 11.4:1 compression. Rated 450 hp, 2021. OHV.
The Chrysler 392ci (2021) · 450 hp is oversquare — the 4.09" bore exceeds the 3.73" stroke by 9.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.73" 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 1.662 is in the range most production engines fall in. Each of the 8 cylinders displaces 49.0 ci (803 cc).
11.4:1 on iron heads is high enough that pump premium or better is normally required, and iron holds heat, so it is the less forgiving side of that line.
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 | 3.73" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 11.4:1 |
| Rod length | 6.2" |
| Rod ratio | 1.662 |
| Bore/stroke ratio | 1.097 |
| Piston deck clearance | 0" |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 450 hp |
| Years | 2021 |
| Bore/stroke character | 1.097 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,730 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.662 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 49.0 ci |
| Static compression | 11.4:1 — high enough that pump premium or better is normally required |
| Intake valve diameter | 2.14" |
|---|---|
| Exhaust valve diameter | 1.65" |
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