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Chevrolet LIH specs: 73 ci (1.2L) 3-cylinder, 2.953 x 3.563 in (75 x 90.5 mm) bore and stroke. Rated 137 hp, 2021–2026. Used in the Chevrolet TrailBlazer.
The Chevrolet 73ci (LIH) is undersquare — the 3.563" stroke exceeds the 2.9528" bore by 17.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.563" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 3 cylinders displaces 24.3 ci (399 cc).
6 factory variants share these dimensions, rated at 137 hp across 2021–2026.
| Displacement | 73 ci / 1.2 L |
|---|---|
| Bore | 2.9528" * |
| Stroke | 3.563" * |
| Cylinders | 3 |
| Configuration | I3 |
| Bore/stroke ratio | 0.829 |
* Bore and stroke from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 137 hp |
| Years | 2021–2026 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2021 | LIH net | 137 @ 5000 * | 162 lb-ft @ 2500 * | — |
| 2022 | LIH net | 137 @ 5000 * | 162 lb-ft @ 2500 * | — |
| 2023 | LIH net | 137 @ 5000 * | 162 lb-ft @ 2500 * | — |
Factory specification sheet. * Not yet cross-verified.
| Bore/stroke character | 0.829 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,563 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 24.3 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 | 137 hp | LIH |
| 2022 | 137 hp | LIH |
| 2023 | 137 hp | LIH |
| 2024 | 137 hp | LIH |
| 2025 | 137 hp | LIH |
| 2026 | 137 hp | LIH |
1 factory vehicle, 2021–2026. Each year opens that model's engine table.