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Studebaker 233ci (1951–1953) specs: 233 ci 8-cylinder, 3.375 x 3.25 in (85.7 x 82.6 mm) bore and stroke, 7:1 compression. Rated 120 hp, 1951–1953.
The Studebaker 233ci (1951–1953) is close to square: 3.375" bore against 3.25" stroke, within 3.8%, which splits the difference between a high-revving layout and a torque layout. The 3.25" stroke does not reach 4,000 ft/min of mean piston speed until about 7,400 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 29.1 ci (477 cc).
7:1 is low by modern standards and generally happy on regular pump fuel.
3 factory variants share these dimensions, rated at 120 hp across 1951–1953.
| Displacement | 233 ci |
|---|---|
| Bore | 3.375" |
| Stroke | 3.25" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 7:1 |
| Bore/stroke ratio | 1.038 |
| Fuel type | gas |
|---|---|
| Advertised HP | 120 hp |
| Years | 1951–1953 |
| Bore/stroke character | 1.038 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,250 ft/min — conservative for a street engine |
| Displacement per cylinder | 29.1 ci |
| Static compression | 7:1 — 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 |
|---|---|---|
| 1951 | 120 hp | — |
| 1952 | 120 hp | — |
| 1953 | 120 hp | — |
1 factory vehicle, 1951–1953. Each year opens that model's engine table.