Oldsmobile 257ci specs: 3.531 x 4.375 in (89.7 x 111.1 mm) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 257 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.531" |
| Stroke | 4.375" |
| Compression | 6.5:1 |
| Advertised power | 105 hp |
| Years | 1949 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Oldsmobile 257ci · 3.531" × 4.375" · 6.5:1 | 257 ci | 3.531" × 4.375" | 6.5:1 | 105 |
This family is represented by a single engine in the database: 257 ci, 6 cylinders, a 3.531" × 4.375" bore and stroke.
All are undersquare — stroke larger than bore, favouring torque low in the range.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.