Chevrolet 85ci specs: 3.228 x 2.606 in (82 x 66.2 mm) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings.
| Displacement | 85 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.228" |
| Stroke | 2.606" |
| Compression | 9.2–9.3:1 |
| Advertised power | 52–57 hp |
| Years | 1976–1977 |
| Cylinder head data | 2 of 2 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Chevrolet 85ci · 3.228" × 2.606" · 9.28:1 | 85 ci | 3.228" × 2.606" | 9.28:1 | 52 |
| Chevrolet 85ci · 3.228" × 2.606" · 9.24:1 | 85 ci | 3.228" × 2.606" | 9.24:1 | 57 |
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.