GMC 229ci specs: 3.736 x 3.484 in (94.9 x 88.5 mm) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 229 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.736" |
| Stroke | 3.484" |
| Compression | 8.6:1 |
| Years | 1981–1984 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| LC3 | 229 ci | 3.736" × 3.484" | 8.6:1 | — |
This family is represented by a single engine in the database: 229 ci, 6 cylinders, a 3.736" × 3.484" bore and stroke.
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.