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Chrysler 392 Hemi, high-performance option specs: 392 ci 8-cylinder, 4.00 x 3.906 in (101.6 x 99.2 mm) bore and stroke. Rated 390 hp, 1957.
The Chrysler 392 Hemi, high-performance option is close to square: 4" bore against 3.906" stroke, within 2.4%, which splits the difference between a high-revving layout and a torque layout. The 3.906" stroke puts mean piston speed at 4,000 ft/min around 6,150 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 49.0 ci (803 cc).
It is one of 8 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 |
|---|---|
| Bore | 4" |
| Stroke | 3.906" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 10–10.1:1 (published figures vary) |
| Bore/stroke ratio | 1.024 |
| Fuel type | gas |
|---|---|
| Advertised HP | 390 hp |
| Years | 1957 |
| Bore/stroke character | 1.024 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,906 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 49.0 ci |
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3 factory vehicles, 1957–1959. Each year opens that model's engine table.