Buick 215ci specs: 3.50 x 2.80 in (88.9 x 71.1 mm) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 215 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.500" |
| Stroke | 2.800" |
| Compression | 8.8–9.0:1 |
| Advertised power | 155–200 hp |
| Years | 1961–1963 |
| Cylinder head data | 2 of 3 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Buick 215ci (1961–1963) | 215 ci | 3.5" × 2.8" | — | 185–200 |
| Buick 215ci · 3.5" × 2.8" · 8.8:1 | 215 ci | 3.5" × 2.8" | 8.8:1 | 155 |
| Buick 215ci · 3.5" × 2.8" · 9:1 | 215 ci | 3.5" × 2.8" | 9:1 | 155 |
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.