Bore, stroke, displacement and compression for all 4 Buick 350ci engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 350 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.800–4.057" |
| Stroke | 3.385–3.850" |
| Compression | 9.7–22.5:1 |
| Advertised power | 105–260 hp |
| Years | 1979–1997 |
| Cylinder head data | 3 of 4 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 1979 350 155HP | 350 ci | 3.8" × 3.85" | 9.701:1 | 155 |
| 1979 350 160HP | 350 ci | 4.001" × 3.484" | 10.301:1 | 160 |
| 1985 350 105HP | 350 ci | 4.057" × 3.385" | 22.5:1 | 105 |
| Buick 350ci · 4.001" × 3.484" · 10.1:1 | 350 ci | 4.001" × 3.484" | 10.1:1 | 260 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 9.701:1 to 22.5:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
3 of 4 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.