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Dodge 325ci specs: 325 ci (5.3L) 8-cylinder, 3.688 x 3.80 in (93.7 x 96.5 mm) bore and stroke, 9.25:1 compression. Rated 285-310 hp, 1957.
The Dodge 325ci is close to square: 3.6875" bore against 3.8" stroke, within 3.0%, which splits the difference between a high-revving layout and a torque layout. The 3.8" stroke puts mean piston speed at 4,000 ft/min around 6,300 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 40.6 ci (666 cc).
9.25:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 4 engines in the Dodge 325ci family, all of them 325 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated from 285 to 310 hp in 1957.
| Displacement | 325 ci / 5.3 L |
|---|---|
| Bore | 3.6875" |
| Stroke | 3.8" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 9.25:1 |
| Bore/stroke ratio | 0.97 |
| Valvetrain | OHV |
|---|---|
| Induction | 4-bbl |
| Fuel type | gas |
| Advertised HP | 285–310 hp |
| Years | 1957 |
| Bore/stroke character | 0.970 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,800 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 40.6 ci |
| Static compression | 9.25:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1957 | 285 hp | — |
| 1957 | 310 hp | — |