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Chevrolet LN2 / L43 specs: 134 ci (2.2L) 4-cylinder, 3.386 x 3.724 in (86 x 94.6 mm) bore and stroke. Rated 120 hp, 1998–2003. Used in the Chevrolet S-10.
The Chevrolet LN2 / L43 is undersquare — the 3.724" stroke exceeds the 3.386" bore by 9.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.724" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. A rod ratio of 1.549 is short — higher piston acceleration and more side-load, typical of stroker combinations and a reason to watch piston speed closely. Each of the 4 cylinders displaces 33.5 ci (549 cc).
It is one of 3 engines in the Chevrolet 134ci family, all of them 134 ci — the differences between them are in compression, heads and rating, not displacement. 6 factory variants share these dimensions, rated at 120 hp across 1998–2003.
| Displacement | 134 ci / 2.2 L |
|---|---|
| Bore | 3.386" |
| Stroke | 3.724" |
| Cylinders | 4 |
| Configuration | I4 |
| Rod length | 5.768" |
| Rod ratio | 1.549 |
| Bore/stroke ratio | 0.909 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 120 hp |
| Years | 1998–2003 |
| Bore/stroke character | 0.909 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,724 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.549 — short — more side loading and piston dwell at TDC, typical of stroker combinations |
| Displacement per cylinder | 33.5 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 |
|---|---|---|
| 1998 | 120 hp | LN2 / L43 |
| 1999 | 120 hp | LN2 / L43 |
| 2000 | 120 hp | LN2 / L43 |
| 2001 | 120 hp | LN2 / L43 |
| 2002 | 120 hp | LN2 / L43 |
| 2003 | 120 hp | LN2 / L43 |