Speed Scene Wiring
LQ4 Wire Harness
6.0L Vortec standalone wire harness — the foundation for a stroker build. Emissions or no-emissions, marine-ready programming available. USA made since 1999.
Start a BuildLQ4 6.0L Wire Harness
The big-bay Vortec — room to build, a common stroker foundation, and standalone wiring with emissions or no-emissions (and marine) programming.
The LQ4 (VIN U) 6.0 sits in a different class from the 4.8/5.3 twins: more mass, more displacement, and the block many builders start from when they want a stroker or serious truck power. Factory ratings typically run ~300–325 HP depending on application.
We build the harness with or without emissions and can accommodate marine programming. With an SSW harness and a full-capability GM controller you keep diagnostics, plus USA-built support behind the install — not just a pinout and a box.
LQ4 Engine Specifications
- Displacement
- 6.0L (5967cc)
- Compression Ratio
- 9.4:1
- Firing Order
- 1-8-7-2-6-5-4-3
- Bore x Stroke
- 101.60 x 92.00mm
- Valves per Cylinder
- 2 (stationary)
- Rocker Arm Ratio
- 1.7
Horsepower & Torque by Application
GMC Sierra Denali
325 HP @ 5000 RPM
370 ft-lb @ 4000 RPM
Chevy Express, Silverado, GMC Sierra, Crewcab, 2500 HD, 3500
300 HP @ 4400 RPM
360 ft-lb @ 4000 RPM
Hummer H2
315 HP @ 5000 RPM
360 ft-lb @ 4000 RPM
Suburban, Denali, Yukon XL, GMC Yukon Denali
320 HP @ 5000 RPM
370 ft-lb @ 4000 RPM
EPA Approved Checklist
- VSS Circuit
- Diagnostic Link Connector
- Correct Emissions Connectors
- VSS Pigtail
- Alternator
- Tach Pigtail
Ready to Build Your LQ4 Harness?
The stroker foundation. Custom-built to your spec. USA made since 1999.
Start a Build