See other engines in this family
The same engine also has a main page: Chevrolet LSD.
GMC LSD specs: 90.8 ci (1.5L) 4-cylinder, 2.913 x 3.409 in (74 x 86.6 mm) bore and stroke, 10:1 compression. Rated 175 hp, 2023–2026. Used in the GMC Terrain.
The GMC Ecotec I4 (LSD) is undersquare — the 3.4094" stroke exceeds the 2.9134" bore by 14.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4094" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 22.7 ci (372 cc).
10:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 9 engines in the Ecotec I4 family, sitting between the 83.2 ci and 145 ci members. 4 factory variants share these dimensions, rated at 175 hp across 2023–2026.
| Displacement | 90.8 ci / 1.5 L |
|---|---|
| Bore | 2.9134" |
| Stroke | 3.4094" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.855 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Redline | 6,500 rpm (factory limit) |
| Advertised HP | 175 hp |
| Years | 2023–2026 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2025 | LSD net | 175 @ 5600 | 203 lb-ft @ 2000 | 10:1 |
| 2026 | LSD net | 175 @ 5600 | 203 lb-ft @ 2000 | 10:1 |
Factory specification sheet.
| Bore/stroke character | 0.855 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,409 ft/min — conservative for a street engine |
| Displacement per cylinder | 22.7 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 2023 | — | LSD |
| 2024 | — | LSD |
| 2025 | 175 hp | LSD |
| 2026 | 175 hp | LSD |
1 factory vehicle, 2023–2026. Each year opens that model's engine table.