GMC 2.7L Turbo I4 specs: 3.661 x 4.016 in (93 x 102 mm) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings.
| Displacement | 166 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.661" |
| Stroke | 4.016" |
| Compression | 10.0:1 |
| Advertised power | 310 hp |
| Years | 2019–2026 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| L3B | 166 ci | 3.6614" × 4.0157" | 10:1 | 310 |
| L3B | 166 ci | 3.6614" × 4.0157" | — | 310 |
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.