Oldsmobile 403ci specs: 4.351 x 3.385 in (110.5 x 86 mm) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 403 ci |
|---|---|
| Cylinders | 8 |
| Bore | 4.351" |
| Stroke | 3.385" |
| Compression | 9.2:1 |
| Advertised power | 185–200 hp |
| Years | 1977 |
| Cylinder head data | 1 of 1 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Oldsmobile 403ci · 4.351" × 3.385" · 9.181:1 | 403 ci | 4.351" × 3.385" | 9.181:1 | 185–200 |
This family is represented by a single engine in the database: 403 ci, 8 cylinders, a 4.351" × 3.385" bore and stroke.
All are oversquare — bore larger than stroke, which favours revs over low-end torque.
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.