LLY Duramax Stock Long Block Engine (2004.5-2005) - Industrial Injection - PDM-LLYSTKLB-E

Industrial Injection LLY Duramax Stock Long Block Engine (2004.5-2005)
Restore factory performance and reliability to your 2004.5-2005 LLY Duramax 6.6L with the Industrial Injection Stock Long Block Engine. Built to meet or exceed OE specifications, this complete long block is the ideal solution for customers looking for a dependable, cost-effective replacement engine without sacrificing quality or durability.
Every Industrial Injection long block is assembled using premium components, precision machining processes, and rigorous quality control standards. From the balanced and blueprinted rotating assembly to the professionally reconditioned cylinder heads, each engine is built to deliver dependable performance, exceptional longevity, and peace of mind for years to come.
Key Features
Engine Features
Remanufactured 6.6L LLY Duramax long block
Designed to meet or exceed OE specifications
Sim tested short block
Balanced and blueprinted rotating assembly
Industrial Injection X Series pistons
Balanced and keyed Duramax crankshaft
Includes stock harmonic damper and stock flex plate
Balanced connecting rods
Keyed camshaft
Pinned oil pump
Stock oil pickup tube
Stock oil pan
Built for long-term reliability and durability
Cylinder Head Features
Reconditioned, milled, and surfaced cylinder heads
High-strength alloy, heat-treated iron-based valve guides
Diamond honed valve guides
Premium nickel-based, non-magnetic valve seat inserts
New unshrouded valves
Multi-angle valve job
New valve springs installed
Duramax OEM head gaskets
Stock head bolts installed
Stock Long Block Construction
Every Industrial Injection Stock Long Block is precision machined, balanced, and assembled to ensure dependable OE-style performance and reliability. The rotating assembly is balanced and blueprinted to reduce vibration, improve longevity, and promote smooth engine operation.
The included cylinder heads are professionally reconditioned and assembled using premium components. Diamond honed valve guides, premium nickel-based valve seat inserts, new unshrouded valves, and new valve springs help restore airflow, sealing performance, and long-term durability.
Each completed engine undergoes simulation testing and extensive quality control procedures before leaving our facility to ensure it meets Industrial Injection's strict standards for reliability and performance.
What's Included
Fully assembled LLY Duramax long block
Reconditioned and assembled cylinder heads
Industrial Injection X Series pistons
Balanced and keyed OEM Duramax crankshaft
Stock harmonic damper
Stock flex plate
Balanced Duramax connecting rods
Keyed Duramax camshaft
Pinned oil pump
Stock oil pickup tube
Stock oil pan
Duramax OEM head gaskets
Stock head bolts
New valve springs
Not Included
Fuel system components
Turbocharger components
Intake and exhaust manifolds
Injectors
Oil cooler
Water pump
Engine accessories
Break-in oil
Vehicle Fitment
2004.5-2005 GM Duramax LLY 6.6L
Chevrolet Silverado 2500HD
Chevrolet Silverado 3500HD
GMC Sierra 2500HD
GMC Sierra 3500HD
Recommended Replacement Items
For the best long-term reliability and performance, Industrial Injection recommends replacing or inspecting the following components during engine installation:
Oil Cooler - Recommended replacement and required if the previous engine experienced a bearing failure
Injectors - Recommended to be tested or replaced
Turbocharger - Recommended replacement if the previous engine has over 100,000 miles; required if the previous engine experienced a bearing failure or dusting event
Water Pump - Recommended replacement for engines with over 100,000 miles
Why Choose the Industrial Injection Stock Long Block?
Built to meet or exceed OE specifications
Precision balanced and blueprinted rotating assembly
Premium reconditioned cylinder heads
Proven Industrial Injection engine-building expertise
Ideal for stock replacement, towing, and daily driving applications
Engineered for long service life and dependable performance
Thoroughly tested and quality inspected before shipment
Warranty Information
This engine is backed by Industrial Injection's 2-Year Unlimited Mileage Warranty .
For optimal engine break-in and long-term performance, Industrial Injection recommends using Driven Racing Oil (Joe Gibbs) Break-In Oil during the first 300-500 miles of operation. This specialized break-in oil helps promote proper ring seating and component wear during the initial startup period. Break-in oil is not included with the engine.
Core Information
A rebuildable core must be returned to receive full core credit. Core returns must be free from excessive damage, missing major components, or conditions that would make the core unusable for remanufacturing.