2004 Hummer H2 6.0L LQ9 Engine – Complete Iron-Block V8 & 4L65E 4×4 Drivetrain Package
For custom car creators, extreme off-road professionals, and heavy-duty truck chassis builders, selecting a complete 2004 Hummer H2 6.0L LQ9 Engine package provides an exceptional combination of rugged cast-iron durability, high factory compression, and advanced low-end torque mapping. Sourced directly from an operational 2004 Hummer H2 with 295,738 original miles, this comprehensive powertrain features the high-performance Vortec HO (High Output) Gen III small-block engine paired alongside its original heavy-duty 4L65E four-speed electronic automatic transmission. Choosing a complete standalone 2004 Hummer H2 6.0L LQ9 Engine pullout assembly streamlines your vehicle conversion project, delivering the entire mechanical block and electronic management core together to eliminate the immense hidden costs of tracking down individual throttle components, computer modules, and accessory brackets separately.https://perlicanparts.org/auto-parts-store-about/
Pulled from a 2004 Hummer H2 with 295,738 miles, this complete 6.0L LQ9 engine and 4L65E 4×4 automatic transmission is perfect for custom projects, replacements, or LS swap builds. Please note, the transfer case shown in pictures is not included.
Engine Pullout Includes:
-
6.0L LQ9 Iron Block Engine
-
4WD 4L65 Automatic Transmission
-
All Belt-Driven Accessories:
-
Power Steering Pump
-
Alternator
-
A/C Compressor
-
Water Pump
-
Starter
-
-
Engine Wiring Harness
-
ECU (Computer)
-
MAF Sensor
This pullout provides a ready-to-install GM V8 drivetrain, ideal for anyone seeking a reliable, high-mileage engine and transmission package for a project or replacement build.
Technical Specifications of the High-Output LQ9 Vortec Power Plant
When planning an upgrade or performance swap centered around a 2004 Hummer H2 6.0L LQ9 Engine for a classic truck retrofit or an OEM vehicle replacement, tracking precise mechanical factory specifications is critical for managing fuel delivery lines and physical engine bay clearances.
-
Engine Core Construction: Resilient cast-iron cylinder block equipped with high-flowing aluminum cylinder heads (Gen III LS architecture)
-
Internal Piston Configurations: Factory flat-top pistons raising the engine compression ratio to an aggressive 10.1:1 configuration
-
Transmission Integration: Heavy-duty 4L65E 4-speed electronic automatic transmission configured for four-wheel-drive output
-
Throttle Control Layout: Drive-by-Wire (DBW) electronic multi-pin throttle body assembly
-
Factory Performance Ratings: 345 Horsepower and 380 lb-ft of Torque
To cross-reference specific block casting marks, internal cylinder configurations, or wiring schematics for high-output General Motors Gen III truck engine architectures, you can check out the comprehensive public databases on LSX Magazine and Tech Reference Indexes.
What is Included in This Complete Drivetrain Turn-Key Package?
This 2004 Hummer H2 6.0L LQ9 Engine pullout assembly is delivered as an ultra-complete mechanical package, preserving the critical factory electronics and belt-driven components that typical salvage yards slice through or break apart.
Electronics, Loom, & Control Architecture
-
Uncut factory engine wiring harness with all primary injector, coil pack, and sensor clips intact.
-
Original matching Engine Control Unit (ECU/PCM) calibrated for high-output 6.0L high-compression fuel parameters.
-
Factory mass airflow (MAF) sensor assembly alongside its corresponding electronic throttle body link.
Mechanical Core Components & Support Assemblies
-
Complete factory composite intake manifold assembly, fuel rails, fuel injectors, and electronic throttle body.
-
Aluminum cylinder heads with complete internal overhead valvetrain, factory camshaft, heavy-duty timing chain, and rugged timing cover.
-
Dual individual coil pack sub-assemblies mounted to the original aluminum valve covers.
-
All front belt-driven accessories: high-output alternator, power steering pump, water pump, and air conditioning compressor.
-
Full internal assembly from the top plenum down to the factory iron-block truck oil pan and high-volume oil pump assembly, plus starter motor.
Why the Hummer LQ9 Platform is the Ultimate Foundation for Performance Swaps
Classic truck builders and off-road hot-rod shops actively prioritize finding a genuine 2004 Hummer H2 6.0L LQ9 Engine over the standard LQ4 variants because of its distinct piston profile and notable compression advantage. Weighing slightly more than an aluminum counterpart but offering unmatched block strength, this cast-iron block handles extreme thermal strain and high RPM loads with ease, while flowing air efficiently due to its heavy-duty aluminum cylinder heads.
Because the 2004 Hummer H2 6.0L LQ9 Engine features premium flat-top pistons that step up mechanical compression, it serves as an incredibly responsive and snappy naturally aspirated foundation. For builders looking to construct a high-performance trail rig or street truck, dropping in an aftermarket performance street camshaft and a set of custom exhaust headers allows this robust 6.0L engine to easily push past the 450-horsepower mark without requiring expensive internal bottom-end overhauls or forced induction.
Freight Shipping Logistics and Universal Drivetrain Compatibility
This universal 2004 Hummer H2 6.0L LQ9 Engine drivetrain package serves as a direct factory replacement for 2002–2007 Hummer H2 and Cadillac Escalade models, and stands as an exceptional custom engine swap foundation for vintage C10 pickups, squarebody 4×4 transformations, or classic muscle car retrofits.
We anchor this entire heavy-duty V8 package onto an industrial wooden shipping pallet, wrapping the iron block, intake assembly, and automatic transmission in protective industrial shrink-wrap to isolate components from road vibrations during freight transit. All motor oils, transmission fluids, and cooling system residues are completely extracted prior to shipment to fully comply with nationwide highway freight transport protocols. To explore complementary conversion gear or alternative mounting setups, make sure to browse our General LS Engine Swaps Inventory or check out our catalog of Tested Automatic Transmissions to match this setup to alternative gear layouts.
Frequently Asked Questions (FAQs)
-
Can I use standard 87 pump gas with this LQ9 engine? Due to the high-compression 10.1:1 profile of the flat-top pistons, using premium 91+ octane fuel is highly recommended to prevent electronic spark retard and extract the full factory 345 horsepower rating.
-
What is required to make this setup standalone for a classic car swap? For vintage vehicle integration, you will need a standalone wiring harness adapter and a professional software reflash to disable the factory VATS (Vehicle Anti-Theft System) security protocol inside the ECU.
-
Was the 4L65E transmission fully inspected? Absolutely. This heavy-duty 4-speed automatic transmission underwent complete internal rotation and functional checkouts, confirming smooth internal clutch engagement, tight planetary gear clearance, and proper shifting pressures prior to vehicle teardown.
-
Where can I buy a reliable 2004 Hummer H2 6.0L LQ9 Engine package online? Our fully certified, compression-tested engine pullouts provide professional car and truck builders with an honest, completely documented, and dependable performance foundation.
Disclaimer: This pre-owned automotive powertrain package is sold intended for professional vehicle restoration, OEM replacement, or private custom engine swap applications. Professional installation, fresh fluid lines, and complete electronic calibrations are highly recommended to maximize field safety and component durability.
