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GMC L52 specs: 211 ci (3.5L) 5-cylinder, 3.661 x 4.016 in (93 x 102 mm) bore and stroke, 10:1 compression. Rated 220 hp. DOHC. Rod ratio and piston speed.
The GMC Vortec 3500 (3.5L I5) (L52) is undersquare — the 4.0157" stroke exceeds the 3.6614" bore by 8.8% — 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 5 cylinders displaces 42.2 ci (692 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 Chevrolet Colorado, GMC Canyon, Hummer H3 and 1 other.
| Displacement | 211 ci / 3.5 L |
|---|---|
| Bore | 3.6614" |
| Stroke | 4.0157" |
| Cylinders | 5 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.912 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 220 hp |
| Bore/stroke character | 0.912 — 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 | 42.2 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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