Buick 151ci specs: 4.002 x 3.01 in (101.7 x 76.5 mm) bore and stroke, shared by all 4 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 151 ci |
|---|---|
| Cylinders | 4 |
| Bore | 4.002" |
| Stroke | 3.010" |
| Compression | 9.1–9.6:1 |
| Advertised power | 84–112 hp |
| Years | 1980–1991 |
| Cylinder head data | 1 of 4 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 1985 151 92HP | 151 ci | 4.002" × 3.01" | 9.63:1 | 92 |
| 1986 151 92HP | 151 ci | 4.002" × 3.01" | 9.14:1 | 92 |
| Buick 151ci (1980–1981) | 151 ci | 4.002" × 3.01" | — | 84–90 |
| L68 | 151 ci | 4.002" × 3.01" | — | 98–112 |
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.