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GMC LLV specs: 177 ci (2.9L) 4-cylinder, 3.76 x 4.016 in (95.5 x 102 mm) bore and stroke. Rated 185 hp, 2007–2012. Used in the GMC Canyon. DOHC.
The GMC Vortec 2900 (2.9L I4) (LLV) is undersquare — the 4.0157" stroke exceeds the 3.7598" bore by 6.4% — 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 44.3 ci (725 cc).
It is one of 2 engines in the Vortec 2900 (2.9L I4) family, all of them 177 ci — the differences between them are in compression, heads and rating, not displacement. 6 factory variants share these dimensions, rated at 185 hp across 2007–2012.
| Displacement | 177 ci / 2.9 L |
|---|---|
| Bore | 3.7598" |
| Stroke | 4.0157" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.936 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 185 hp |
| Years | 2007–2012 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2009 | LLV net | 185 @ 5600 * | 190 lb-ft @ 2800 * | — |
| 2010 | LLV net | 185 @ 5600 * | 190 lb-ft @ 2800 * | — |
| 2011 | LLV net | 185 @ 5600 * | 190 lb-ft @ 2800 * | — |
| 2012 | LLV net | 185 @ 5600 * | 190 lb-ft @ 2800 * | — |
Factory specification sheet. * Not yet cross-verified.
| Bore/stroke character | 0.936 — 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 | 44.3 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 |
|---|---|---|
| 2007 | 185 hp | LLV |
| 2008 | 185 hp | LLV |
| 2009 | 185 hp | LLV |
| 2010 | 185 hp | LLV |
| 2011 | 185 hp | LLV |
| 2012 | 185 hp | LLV |
1 factory vehicle, 2007–2012. Each year opens that model's engine table.