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GMC LF1 / LFW specs: 183 ci (3.0L) 6-cylinder, 3.504 x 3.161 in (89 x 80.3 mm) bore and stroke. Rated 264 hp, 2010–2012. Used in the GMC Terrain.
The GMC LF1 / LFW is oversquare — the 3.5039" bore exceeds the 3.1614" stroke by 10.8% — a layout that favors airflow and RPM over leverage at the crank. The 3.1614" stroke does not reach 4,000 ft/min of mean piston speed until about 7,600 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 30.5 ci (500 cc).
It is one of 3 engines in the GMC 183ci family, all of them 183 ci — the differences between them are in compression, heads and rating, not displacement. 3 factory variants share these dimensions, rated at 264 hp across 2010–2012.
| Displacement | 183 ci / 3 L |
|---|---|
| Bore | 3.5039" |
| Stroke | 3.1614" |
| Cylinders | 6 |
| Configuration | V6 |
| Bore/stroke ratio | 1.108 |
| Fuel type | gas |
|---|---|
| Advertised HP | 264 hp |
| Years | 2010–2012 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2010 | LF1 net | 264 @ 6950 | 222 lb-ft @ 5100 | — |
| 2011 | LF1 / LFW net | 264 @ 6950 * | 222 lb-ft @ 5100 * | — |
| 2012 | LF1 / LFW net | 264 @ 6950 * | 222 lb-ft @ 5100 * | — |
Factory specification sheet. * Not yet cross-verified.
| Bore/stroke character | 1.108 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,161 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 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 |
|---|---|---|
| 2010 | 264 hp | LF1 / LFW |
| 2011 | 264 hp | LF1 / LFW |
| 2012 | 264 hp | LF1 / LFW |
3 factory vehicles, 2010–2014. Each year opens that model's engine table.