LQ4 6.0L engine: specs, donor vehicles & swap notes
| Spec | Value |
|---|---|
| RPO | LQ4 |
| Family | Generation III |
| Years | 1999–2008 |
| Displacement | 6.0 L / 364 ci |
| Horsepower | 300–335 hp |
| Torque | 355–375 lb-ft |
| Bore × stroke | 4.0 × 3.622 in |
| Compression | 9.40:1 |
| Block | iron |
| AFM/DOD | No |
| VIN 8th digit | U |
Iron/Iron-Alum. heads, 1999–2000 engines have iron heads
Specs from secondary sources; GM ratings varied by year and vehicle.
Donor vehicles with the LQ4
Where to find one at the junkyard. Confirm with the RPO sticker in the glovebox or the 8th VIN digit.
| Vehicle | Years |
|---|---|
| Chevrolet Express/GMC Savana 2500/3500 | 2003–2007 |
| Chevrolet Silverado/GMC Sierra 1500HD/2500/2500HD/3500 | 1999–2007 |
| Chevrolet Suburban 2500/GMC Yukon XL 2500 | 2000–2006 |
| Chevrolet W-Series/GMC W-Series/Isuzu NPR | 2003–2008 |
| GMC Sierra C3 | 2001 |
| GMC Sierra Denali | 2002–2007 |
| GMC Yukon/Yukon XL Denali and Chevrolet Suburban 1500 LTZ | 2002–2006 |
| Hummer H2 | 2002–2007 |
Next steps
- Find a cam for the LQ4
- Compare every LS donor engine
- Size injectors and fuel pump
- Swap guides by vehicle
Questions about the LQ4
- LQ4 vs LQ9: what's the difference?
- Why does a 1999–2000 LQ4 need a different flexplate?
- How do I tell an LQ4 from an LQ9?
- What year did the LQ4/LQ9 become Gen IV?
Sources