Bore, stroke, displacement and compression for all 2 Buick Fireball V6 engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 198–225 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.626–3.752" |
| Stroke | 3.201–3.402" |
| Compression | 8.8–9.0:1 |
| Advertised power | 135–155 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 225 | 225 ci | 3.752" × 3.4016" | 9:1 | 155 |
| 198 | 198 ci | 3.626" × 3.2008" | 8.8:1 | 135 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
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.