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Buick LGX specs: 222.6 ci (3.6L) 6-cylinder, 3.74 x 3.378 in (95 x 85.8 mm) bore and stroke. Rated 310 hp, 2018–2020. DOHC. Rod ratio and piston speed.
The Buick GM High Feature V6 (LGX) is oversquare — the 3.74" bore exceeds the 3.378" stroke by 10.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.378" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 37.1 ci (608 cc).
It is one of 5 engines in the GM High Feature V6 family, sitting between the 217 ci and 222.7 ci members. 3 factory variants share these dimensions, rated at 310 hp across 2018–2020.
| Displacement | 222.6 ci / 3.6 L |
|---|---|
| Bore | 3.74" |
| Stroke | 3.378" |
| Cylinders | 6 |
| Configuration | V6 |
| Bore/stroke ratio | 1.107 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 310 hp |
| Years | 2018–2020 |
| Bore/stroke character | 1.107 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,378 ft/min — conservative for a street engine |
| Displacement per cylinder | 37.1 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 |
|---|---|---|
| 2018 | 310 hp | LGX |
| 2019 | 310 hp | LGX |
| 2020 | 310 hp | LGX |