Oldsmobile 324ci specs: 3.875 x 3.438 in (98.4 x 87.3 mm) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings.
| Displacement | 324 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.875" |
| Stroke | 3.438" |
| Compression | 8.3–9.3:1 |
| Advertised power | 170–240 hp |
| Years | 1954–1956 |
| Cylinder head data | 3 of 3 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Oldsmobile 324ci · 3.875" × 3.438" · 8.25:1 | 324 ci | 3.875" × 3.438" | 8.25:1 | 170–185 |
| Oldsmobile 324ci · 3.875" × 3.438" · 8.5:1 | 324 ci | 3.875" × 3.438" | 8.5:1 | 185–202 |
| Oldsmobile 324ci · 3.875" × 3.438" · 9.25:1 | 324 ci | 3.875" × 3.438" | 9.25:1 | 230–240 |
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.