See other engines in this family
The same engine also has a main page: Chevrolet LGX.
Chevrolet LGZ specs: 220 ci (3.6L) 6-cylinder, 3.74 x 3.378 in (95 x 85.8 mm) bore and stroke, 11.5:1 compression. Rated 308 hp, 2017–2022.
The Chevrolet 220ci (LGZ) is oversquare — the 3.7402" 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 36.7 ci (601 cc).
11.5:1 is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 2 engines in the Chevrolet 220ci family, the largest at 220 ci. 6 factory variants share these dimensions, rated at 308 hp across 2017–2022.
| Displacement | 220 ci / 3.6 L |
|---|---|
| Bore | 3.7402" |
| Stroke | 3.378" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 11.5:1 |
| Bore/stroke ratio | 1.107 |
| Fuel type | gas |
|---|---|
| Advertised HP | 308 hp |
| Years | 2017–2022 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2017 | LGZ net | 308 @ 6800 * | 275 lb-ft @ 4000 * | — |
| 2018 | LGZ net | 308 @ 6800 * | 275 lb-ft @ 4000 * | — |
| 2019 | LGZ net | 308 @ 6800 * | 275 lb-ft @ 4000 * | — |
| 2020 | LGZ net | 308 @ 6800 * | 275 lb-ft @ 4000 * | — |
| 2021 | LGZ net | 308 @ 6800 * | 275 lb-ft @ 4000 * | — |
| 2022 | LGZ net | 308 @ 6800 * | 275 lb-ft @ 4000 * | — |
Factory specification sheet. * Not yet cross-verified.
| 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 | 36.7 ci |
| Static compression | 11.5:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| 2017 | 308 hp | LGZ |
| 2018 | 308 hp | LGZ |
| 2019 | 308 hp | LGZ |
| 2020 | 308 hp | LGZ |
| 2021 | 308 hp | LGZ |
| 2022 | 308 hp | LGZ |
1 factory vehicle, 2017–2022. Each year opens that model's engine table.