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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, 10:1 compression. Rated 185 hp. DOHC. Rod ratio and piston speed.
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).
10:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
Factory fitments include the GMC Canyon, Chevrolet Colorado, Isuzu i-290.
| Displacement | 177 ci / 2.9 L |
|---|---|
| Bore | 3.7598" |
| Stroke | 4.0157" |
| Cylinders | 4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.936 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 185 hp |
| 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 |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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