Industrial Injection LB7 Duramax Premium Stock Plus Long Block Engine (2001-2004)
Restore factory performance and long-term reliability to your 2001–2004 LB7 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 Premium Stock Plus 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
- Torque Lock injector cups installed
- 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 Premium Stock Plus 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.
Exclusive to the LB7 Premium Stock Plus platform, the cylinder heads are upgraded with Industrial Injection Torque Lock Injector Cups. Unlike factory press-fit injector cups, Torque Lock cups are mechanically secured within the cylinder head to prevent movement under extreme heat and cylinder pressure. This proven upgrade helps eliminate one of the most common LB7 failure points by reducing the risk of injector cup movement, coolant intrusion, combustion leaks, and injector sealing issues.
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 LB7 Duramax long block
- Reconditioned and assembled Premium Stock Plus cylinder heads
- Torque Lock injector cups installed
- 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
2001–2004 GM Duramax LB7 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 Stock Plus cylinder heads with Torque Lock injector cups
- Eliminates common LB7 injector cup sealing issues
- 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.