Chevrolet 97ci specs: 3.228 x 2.98 in (82 x 75.7 mm) bore and stroke, shared by all 5 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 97 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.228" |
| Stroke | 2.980" |
| Compression | 9.2–9.6:1 |
| Advertised power | 63–110 hp |
| Years | 1977–1988 |
| Cylinder head data | 3 of 5 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| LC9 | 97 ci | 3.228" × 2.98" | — | 74 |
| LW0 | 97 ci | 3.228" × 2.98" | — | 110 |
| Chevrolet 97ci · 3.228" × 2.98" · 9.2:1 | 97 ci | 3.228" × 2.98" | 9.2:1 | 63 |
| Chevrolet 97ci · 3.228" × 2.98" · 9.18:1 | 97 ci | 3.228" × 2.98" | 9.18:1 | 63–68 |
| Chevrolet 97ci · 3.228" × 2.98" · 9.64:1 | 97 ci | 3.228" × 2.98" | 9.64:1 | 65–74 |
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.