See other engines in this family
The same engine also has a main page: Chevrolet LQ4.
Chevrolet LQ4 specs: 364 ci (6.0L) 8-cylinder, 4.00 x 3.622 in (101.6 x 92 mm) bore and stroke, 9.4:1 compression. Rated 300-335 hp, 1999–2008.
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. A rod ratio of 1.684 is in the range most production engines fall in. Each of the 8 cylinders displaces 45.5 ci (746 cc).
9.4:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 61 engines in the LS family, sitting between the 293 ci and 454 ci members. 21 factory variants share these dimensions, rated from 300 to 335 hp across 1999–2008.
| Displacement | 364 ci / 6 L |
|---|---|
| Bore | 4" |
| Stroke | 3.622" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 9.4:1 |
| Rod length | 6.098" |
| Rod ratio | 1.684 |
| Bore/stroke ratio | 1.104 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Firing order | 1-8-7-2-6-5-4-3 |
| Advertised HP | 300–335 hp |
| Years | 1999–2008 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2002 | LQ4 net | 300 @ 4400 * | 360 lb-ft @ 4000 * | — |
| 2003 | LQ4 net | 300 @ 4400 * | 360 lb-ft @ 4000 * | — |
| 2004 | LQ4 net | 325 @ 5200 * | 365 lb-ft @ 4000 * | — |
| 2007 | LQ4 net | 300 @ 4400 | 360 lb-ft @ 4000 | 9.4:1 |
Factory specification sheet. * Not yet cross-verified.
| 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 |
| Rod ratio | 1.684 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 45.5 ci |
| Static compression | 9.4:1 — low by modern standards, generally happy on regular pump fuel |
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 |
| 2002 | 300 hp | LQ4 |
| 2002 | 320 hp | LQ4 |
| 2003 | 300 hp | LQ4 |
| 2003 | 316 hp | LQ4 |
| 2003 | 320 hp | LQ4 |
| 2004 | 300 hp | LQ4 |
| 2004 | 316 hp | LQ4 |
| 2004 | 325 hp | LQ4 |
| 2005 | — | LQ4 |
| 2005 | 300 hp | LQ4 |
| 2005 | 325 hp | LQ4 |
| 2006 | 300 hp | LQ4 |
| 2006 | 325 hp | LQ4 |
| 2006 | 335 hp | LQ4 |
| 2007 | 300 hp | LQ4 |
| 2007 | 325 hp | LQ4 |
| 2008 | — | LQ4 |
8 factory vehicles, 1999–2008. Each year opens that model's engine table.