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Hudson 254ci (1948–1952) specs: 254 ci 8-cylinder, 3.00 x 4.50 in (76.2 x 114.3 mm) bore and stroke. Rated 128 hp, 1948–1952. Used in the Hudson Hudson.
The Hudson 254ci (1948–1952) is undersquare — the 4.5" stroke exceeds the 3" bore by 33.3% — a layout that trades peak RPM for leverage and torque low in the range. With a 4.5" stroke, mean piston speed reaches 4,000 ft/min at only 5,350 RPM — the practical ceiling for a production bottom end — which is why a stroke this long makes its power low and runs out of safe revs early. Each of the 8 cylinders displaces 31.8 ci (520 cc).
5 factory variants share these dimensions, rated at 128 hp across 1948–1952.
| Displacement | 254 ci |
|---|---|
| Bore | 3" |
| Stroke | 4.5" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 6.5–6.7:1 (published figures vary) |
| Bore/stroke ratio | 0.667 |
| Fuel type | gas |
|---|---|
| Advertised HP | 128 hp |
| Years | 1948–1952 |
| Bore/stroke character | 0.667 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,500 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 31.8 ci |
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 |
|---|---|---|
| 1948 | 128 hp | — |
| 1949 | 128 hp | — |
| 1950 | 128 hp | — |
| 1951 | 128 hp | — |
| 1952 | — | — |
1 factory vehicle, 1948–1952. Each year opens that model's engine table.