Speed Scene Wiring
LM7 Wire Harness
5.3L Vortec standalone wire harness — emissions or no-emissions, marine-ready programming available. Full GM diagnostic capabilities. USA made since 1999.
Start a BuildLM7 5.3L Wire Harness
The 5.3 (5300) is a highly capable engine, great for mid-size engine compartments and is considerably smaller than the 6.0. The 4.8 and the 5.3 share the same block but the internals — crank and rods — are not the same. The intake is taught and ready for climbing. A taller plenum design / tunnel ram effect allows the air to hit the intake ports, yielding efficient power with a snap of torque.
Speed Scene Wiring fabricates this fuel injected wire harness, with emissions or without. If you require this engine in a marine environment, we can accommodate with the correct computer program. The nice thing about running a SSW wire harness and GM electronics are diagnostic capabilities. If you decide to roll with the smaller ECM / VCM / PCM (these are neat names for computers), you will lack the diagnostic capability.
LM7 Engine Specifications
- Displacement
- 5.3L (5328cc)
- Compression Ratio
- 9.45:1
- Firing Order
- 1-8-7-2-6-5-4-3
- Bore x Stroke
- 96.01 x 92.00mm
- Valves per Cylinder
- 2 (stationary)
- Rocker Arm Ratio
- 1.7
Horsepower & Torque by Application
Cadillac Escalade, GMC Sierra, Tahoe, Suburban, Silverado, Yukon, Yukon XL, Avalanche
285 HP @ 5200 RPM
325 ft-lb @ 4000 RPM
GMC Savana (1500/2500), Chevy Express
295 HP @ 5200 RPM
330 ft-lb @ 4000 RPM
TrailBlazer, GMC Envoy XL
290 HP @ 5200 RPM
330 ft-lb @ 4000 RPM
EPA Approved Checklist
- VSS Circuit
- Diagnostic Link Connector
- Correct Emissions Connectors
- VSS Pigtail
- Alternator
- Tach Pigtail
Ready to Build Your LM7 Harness?
Custom-built to your spec. Emissions or no-emissions. Marine-ready. USA made since 1999.
Start a Build