GMC 183ci specs: 3.307 x 3.543 in (84 x 90 mm) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 183 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.307" |
| Stroke | 3.543" |
| Advertised power | 277–305 hp |
| Years | 2020–2026 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| LM2 | 183 ci | 3.3071" × 3.5433" | — | 277 |
| LZ0 | 183 ci | 3.3071" × 3.5433" | — | 305 |
All are undersquare — stroke larger than bore, favouring torque low in the range.
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.