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GMC LSY specs: 121.9 ci (2.0L) 4-cylinder, 3.268 x 3.634 in (83 x 92.3 mm) bore and stroke. Built 2020–2023. Used in the GMC Acadia. DOHC.
The GMC 122ci (LSY) is undersquare — the 3.6339" stroke exceeds the 3.2677" bore by 10.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.6339" stroke puts mean piston speed at 4,000 ft/min around 6,600 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.5 ci (499 cc).
It is one of 2 engines in the GMC 122ci family, the smallest at 121.9 ci. 4 factory variants share these dimensions across 2020–2023.
| Displacement | 121.9 ci / 2 L |
|---|---|
| Bore | 3.2677" |
| Stroke | 3.6339" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.899 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Years | 2020–2023 |
| Bore/stroke character | 0.899 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,634 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2020 | — | LSY |
| 2021 | — | LSY |
| 2022 | — | LSY |
| 2023 | — | LSY |
1 factory vehicle, 2020–2023. Each year opens that model's engine table.