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Chevrolet L3T specs: 79 ci (1.3L) 3-cylinder, 3.11 x 3.465 in (79 x 88 mm) bore and stroke. Rated 155 hp, 2021–2026. Used in the Chevrolet TrailBlazer. DOHC.
The Chevrolet Ecotec (L3T) is undersquare — the 3.4646" stroke exceeds the 3.1102" bore by 10.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4646" stroke puts mean piston speed at 4,000 ft/min around 6,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 3 cylinders displaces 26.3 ci (432 cc).
It is one of 26 engines in the Ecotec family, sitting between the 61 ci and 150 ci members. 6 factory variants share these dimensions, rated at 155 hp across 2021–2026.
| Displacement | 79 ci / 1.3 L |
|---|---|
| Bore | 3.1102" |
| Stroke | 3.4646" |
| Cylinders | 3 |
| Configuration | I3 |
| Bore/stroke ratio | 0.898 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 155 hp |
| Years | 2021–2026 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2021 | L3T net | 155 @ 5600 * | 174 lb-ft @ 1600 * | — |
| 2022 | L3T net | 155 @ 5600 * | 174 lb-ft @ 1600 * | — |
| 2023 | L3T net | 155 @ 5600 * | 174 lb-ft @ 1600 * | — |
Factory specification sheet. * Not yet cross-verified.
| Bore/stroke character | 0.898 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,465 ft/min — conservative for a street engine |
| Displacement per cylinder | 26.3 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 |
|---|---|---|
| 2021 | 155 hp | L3T |
| 2022 | 155 hp | L3T |
| 2023 | 155 hp | L3T |
| 2024 | 155 hp | L3T |
| 2025 | 155 hp | L3T |
| 2026 | 155 hp | L3T |
1 factory vehicle, 2021–2026. Each year opens that model's engine table.