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Chevrolet LQ4 specs: 364 ci (6.0L) 8-cylinder, 4.00 x 3.622 in (101.6 x 92 mm) bore and stroke. Rated 300-335 hp, 1999–2007.
The Chevrolet LS (LQ4) is oversquare — the 4" bore exceeds the 3.622" stroke by 10.4% — a layout that favors airflow and RPM over leverage at the crank. The 3.622" stroke puts mean piston speed at 4,000 ft/min around 6,650 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 45.5 ci (746 cc).
It is one of 57 engines in the LS family, sitting between the 293 ci and 454 ci members. 18 factory variants share these dimensions, rated from 300 to 335 hp across 1999–2007.
| Displacement | 364 ci / 6 L |
|---|---|
| Bore | 4" |
| Stroke | 3.622" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.104 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 300–335 hp |
| Years | 1999–2007 |
| Bore/stroke character | 1.104 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,622 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 45.5 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 |
|---|---|---|
| 1999 | 300 hp | LQ4 |
| 2000 | 300 hp | LQ4 |
| 2001 | 300 hp | LQ4 |
| 2001 | 320 hp | LQ4 |
| 2001 | 325 hp | LQ4 |
| 2002 | 300 hp | LQ4 |
| 2002 | 320 hp | LQ4 |
| 2002 | 325 hp | LQ4 |
| 2003 | 300 hp | LQ4 |
| 2003 | 320 hp | LQ4 |
| 2003 | 325 hp | LQ4 |
| 2004 | 300 hp | LQ4 |
| 2004 | 325 hp | LQ4 |
| 2005 | — | LQ4 |
| 2005 | 300 hp | LQ4 |
| 2006 | 300 hp | LQ4 |
| 2006 | 335 hp | LQ4 |
| 2007 | 300 hp | LQ4 |