Buick 301ci specs: 4.002 x 3.01 in (101.7 x 76.5 mm) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 301 ci |
|---|---|
| Cylinders | 8 |
| Bore | 4.002" |
| Stroke | 3.010" |
| Compression | 8.7:1 |
| Advertised power | 135–150 hp |
| Years | 1977–1980 |
| Cylinder head data | 1 of 3 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Buick 301ci · 4.002" × 3.010" · 8.741:1 | 301 ci | 4.002" × 3.01" | 8.741:1 | 140–150 |
| L27 | 301 ci | 4.002" × 3.01" | — | 140 |
| Buick 301ci (1977) | 301 ci | 4.002" × 3.01" | — | 135 |
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.