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

Industrial Injection LLY Duramax Premium Stock Plus Long Block Engine (2004.5-2005)
Restore factory performance and long-term reliability to your 2004.5-2005 LLY Duramax 6.6L with the Industrial Injection Premium Stock Plus Long Block Engine. Designed to eliminate many of the common failure points associated with the factory Duramax platform, this complete long block combines premium engine components, precision machining, and proven assembly techniques to deliver exceptional durability and dependable performance.
Every Premium Stock Plus Long Block is built using the highest quality parts and machining processes available. From the balanced and blueprinted rotating assembly to the professionally reconditioned cylinder heads, each engine is meticulously assembled and tested to ensure maximum reliability and longevity. Whether you're replacing a failed engine or building a dependable daily driver, towing rig, or work truck, this long block provides a complete, ready-to-install foundation built to last.
Key Features
Engine Features
Balanced and blueprinted rotating assembly
Sim tested short block
Industrial Injection X Series coated, chamfered, and de-lipped pistons
Balanced and keyed OEM Duramax crankshaft
ARP main bolts installed
Balanced connecting rods
ARP rod bolts installed
Keyed Duramax camshaft
Pinned oil pump
New water pump
New oil pickup tube
Stock oil pan included
Built for maximum durability and long-term reliability
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
Premium C Grade head gaskets
ARP 2000 head studs installed
Premium Stock Plus Engine Construction
Every Industrial Injection Premium Stock Plus Long Block is precision machined, balanced, and assembled to exacting specifications. The rotating assembly is carefully balanced and blueprinted to ensure smooth operation and consistent performance throughout the engine's lifespan.
Industrial Injection X Series coated, chamfered, and de-lipped pistons help improve durability while reducing stress concentrations commonly found in factory piston designs. Combined with a keyed crankshaft, keyed camshaft, pinned oil pump, and premium ARP fasteners, this engine is engineered to provide exceptional reliability in both stock and mild performance applications.
The included cylinder heads are professionally reconditioned, resurfaced, and assembled with premium components. Featuring diamond honed valve guides, high-strength heat-treated valve guides, premium nickel-based valve seat inserts, new unshrouded valves, and new valve springs, these heads are built to provide excellent sealing, airflow, and long-term durability.
Premium C Grade head gaskets and ARP 2000 head studs provide superior clamping force and sealing capability, helping ensure reliable performance under demanding towing, daily driving, and work truck conditions.
Each completed long block undergoes simulation testing and rigorous quality control procedures before leaving our facility.
What's Included
Fully assembled LLY Duramax long block
Reconditioned and assembled cylinder heads
Industrial Injection X Series coated, chamfered, and de-lipped pistons
Balanced and keyed OEM Duramax crankshaft
Balanced connecting rods
ARP main bolts
ARP rod bolts
Keyed camshaft
Pinned oil pump
New water pump
New oil pickup tube
Stock oil pan
Premium C Grade head gaskets
ARP 2000 head studs
New valve springs
Not Included
Fuel system components
Turbocharger components
Intake and exhaust manifolds
Injectors
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
Why Choose the Industrial Injection Premium Stock Plus Long Block?
Designed to address common Duramax engine failures
Premium machining and assembly processes
Balanced and blueprinted rotating assembly
Upgraded X Series piston technology
Reconditioned cylinder heads with premium valvetrain components
ARP fasteners throughout critical engine components
Premium C Grade head gaskets and ARP 2000 head studs included
Built using proven Industrial Injection engine-building expertise
Ideal for stock replacement, towing, and work truck applications
Engineered for maximum reliability and long service life
Warranty Information
This engine is backed by Industrial Injection's 2-Year Warranty .
For proper engine break-in, Industrial Injection recommends using Driven Racing Oil (Joe Gibbs) Break-In Oil for the first 300-500 miles of operation. Break-in oil is not included with the engine.