LB7 Duramax Premium Stock Plus Long Block Engine (2001-2004) - Industrial Injection - PDM-LB7STKLB

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.

• 2001 Chevrolet Silverado 2500 HD 6.6L DIESEL
• 2001 Chevrolet Silverado 3500 6.6L DIESEL
• 2001 GMC Sierra 2500 HD 6.6L DIESEL
• 2001 GMC Sierra 3500 6.6L DIESEL
• 2002 Chevrolet Silverado 2500 HD 6.6L DIESEL
• 2002 Chevrolet Silverado 3500 6.6L DIESEL
• 2002 GMC Sierra 2500 HD 6.6L DIESEL
• 2002 GMC Sierra 3500 6.6L DIESEL
• 2003 Chevrolet Silverado 2500 HD 6.6L DIESEL
• 2003 Chevrolet Silverado 3500 6.6L DIESEL
• 2003 GMC Sierra 2500 HD 6.6L DIESEL
• 2003 GMC Sierra 3500 6.6L DIESEL
• 2004 Chevrolet Silverado 2500 HD 6.6L DIESEL
• 2004 Chevrolet Silverado 3500 6.6L DIESEL
• 2004 GMC Sierra 2500 HD 6.6L DIESEL
• 2004 GMC Sierra 3500 6.6L DIESEL