LLY Duramax Stage 2 Long Block Engine (2004.5-2005) - Industrial Injection - PDM-LLYRLB

Industrial Injection LLY Duramax Stage 2 Long Block Engine (2004.5-2005)
Take your 2004.5-2005 LLY Duramax to the next level with the Industrial Injection Stage 2 Long Block Engine. Designed for high-horsepower street trucks, drag racing, sled pulling, and competition applications, this engine package is built to handle serious power while maintaining the durability and reliability that Industrial Injection engines are known for.
Every Stage 2 Long Block is precision machined, balanced, blueprinted, and assembled using premium performance components. Combined with Industrial Injection's fully CNC Ported and Polished Cylinder Heads, this engine is engineered to maximize airflow, increase horsepower potential, and provide the durability required for demanding performance applications.
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
14mm Gorilla Girdle with ARP main studs
Wagler HD forged connecting rods
Industrial Injection keyed billet alternate firing camshaft
ATI Super Damper
Billet flexplate
Pinned oil pump
New water pump
New oil pickup tube
Stock oil pan
Built for high-performance and competition use
Optional billet crankshaft upgrade available
Cylinder Head Features
Fully CNC ported and polished cylinder heads
Precision machined using a 5-axis CNC cylinder head porting machine
CAD/CAM software-developed port design
Diamond honed valve guides
Unshrouded valves for increased airflow
High-strength alloy, heat-treated iron-based valve guides
Premium nickel-based, non-magnetic valve seat inserts
Multi-angle valve job
130 lb valve springs installed
Fully assembled and ready for performance use
Stage 2 Performance Engine Construction
The Industrial Injection Stage 2 Long Block is designed for enthusiasts who demand more than a stock replacement engine. Every rotating assembly is balanced and blueprinted to ensure smooth operation and maximum durability under high horsepower conditions.
Industrial Injection X Series pistons provide enhanced strength and durability, while Wagler HD forged connecting rods and the 14mm Gorilla Girdle help reinforce the bottom end against extreme cylinder pressures. The keyed crankshaft, keyed billet alternate firing camshaft, pinned oil pump, ATI Super Damper, and billet flexplate work together to create a foundation capable of handling serious horsepower and competition use.
The included Ported and Polished Cylinder Heads are CNC machined using Industrial Injection's advanced 5-axis porting technology. This process dramatically improves airflow consistency and cylinder filling, helping support increased horsepower, improved throttle response, and greater overall engine efficiency.
Each engine is simulation tested and subjected to rigorous quality control procedures before leaving our facility.
What's Included
Fully assembled LLY Duramax Stage 2 long block
CNC Ported and Polished cylinder heads
Industrial Injection X Series pistons
Balanced and keyed OEM Duramax crankshaft
Wagler HD forged connecting rods
14mm Gorilla Girdle
ARP main studs
Industrial Injection keyed billet alternate firing camshaft
ATI Super Damper
Billet flexplate
Pinned oil pump
New water pump
New oil pickup tube
Stock oil pan
130 lb valve springs
Not Included
Additional assembly gaskets
Fuel system components
Turbocharger components
Injectors
Exhaust manifolds
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 Stage 2 Long Block?
Built for high-horsepower street and competition applications
Fully CNC Ported and Polished cylinder heads included
Reinforced bottom end with forged rods and Gorilla Girdle
Premium performance components throughout
Precision balanced and blueprinted rotating assembly
Billet alternate firing camshaft included
Increased airflow and horsepower potential
Proven Industrial Injection engine-building expertise
Designed to withstand extreme power levels and demanding conditions
Thoroughly tested and quality inspected before shipment
Break-In Recommendation
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. Break-in oil is not included with the engine.