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GMC L3B specs: 166 ci (2.7L) 4-cylinder, 3.661 x 4.016 in (93 x 102 mm) bore and stroke. Rated 310 hp, 2019–2026. Used in the Chevrolet Silverado 1500. DOHC.
The GMC 2.7L Turbo I4 (L3B) is undersquare — the 4.0157" stroke exceeds the 3.6614" bore by 8.8% — a layout that trades peak RPM for leverage and torque low in the range. The 4.0157" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 41.5 ci (680 cc).
It is one of 2 engines in the 2.7L Turbo I4 family, all of them 166 ci — the differences between them are in compression, heads and rating, not displacement. 8 factory variants share these dimensions, rated at 310 hp across 2019–2026.
| Displacement | 166 ci / 2.7 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 4.0157" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.912 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 310 hp |
| Years | 2019–2026 |
| Bore/stroke character | 0.912 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,016 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 41.5 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 |
|---|---|---|
| 2019 | 310 hp | L3B |
| 2020 | 310 hp | L3B |
| 2021 | 310 hp | L3B |
| 2022 | 310 hp | L3B |
| 2023 | 310 hp | L3B |
| 2024 | 310 hp | L3B |
| 2025 | 310 hp | L3B |
| 2026 | 310 hp | L3B |