Industrial Injection LLY Duramax Premium Stock Plus Builder Box (2004.5-2005)

Build Your Own LLY Duramax With Confidence

The Industrial Injection 6.6L LLY Duramax Premium Stock Plus Builder Box was designed for diesel enthusiasts, engine builders, and mechanics who want the satisfaction of assembling their own engine while saving thousands in labor and assembly costs.

This complete unassembled short block package includes all the critical machined components and premium internal parts required to build a reliable, long-lasting LLY Duramax engine. Every component is precision machined, balanced, and blueprinted to Industrial Injection specifications, providing a solid foundation for stock replacement, towing, work truck, and mild performance applications.

By combining premium machine work with upgraded components, the Premium Stock Plus Builder Box delivers exceptional reliability, durability, and value while allowing you to complete the final assembly yourself.

Key Features

Premium Machine Work

• Block machined using a plateau honing process
• Torque plate honed cylinders
• Machined to blueprint specifications
• Precision externally balanced crankshaft
• Precision-balanced connecting rods
• Professionally balanced rotating assembly

Premium Internal Components

• Industrial Injection X Series Coated, Chamfered & De-Lipped Pistons
• Balanced connecting rods with ARP rod bolts
• Keyed externally balanced crankshaft
• Keyed camshaft
• ARP main studs
• Coated H-Series main bearings
• Coated H-Series rod bearings

Reliability Upgrades

• Pinned oil pump
• Externally balanced crankshaft
• Keyed cam and crank
• Complete lower engine gasket set

Premium Stock Plus Builder Box Construction

Every Premium Stock Plus Builder Box begins with a carefully inspected engine block that undergoes precision machining and blueprinting processes. The cylinders are plateau honed using torque plates to ensure proper cylinder geometry and optimal ring sealing under operating conditions.

The externally balanced rotating assembly is engineered to minimize vibration while maximizing durability and long-term reliability. Industrial Injection X Series Coated, Chamfered & De-Lipped Pistons help eliminate stress risers commonly found in factory piston designs while improving piston durability under heavy towing and daily driving conditions.

Combined with a keyed crankshaft, keyed camshaft, pinned oil pump, ARP fasteners, coated H-Series bearings, and precision machine work, this builder box provides the same proven foundation used in Industrial Injection Premium Stock Plus engine builds.

This package is ideal for customers who want professional machine work and premium components while retaining the flexibility and cost savings of final engine assembly.

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 Builder Box?

• Save thousands in engine assembly labor
• Blueprint-machined for superior reliability
• Externally balanced rotating assembly
• Keyed crankshaft and keyed camshaft
• Pinned oil pump for added durability
• Industrial Injection X Series Coated, Chamfered & De-Lipped Pistons
• ARP fasteners throughout critical engine components
• Coated H-Series performance bearings
• Perfect foundation for stock replacement, towing, and work truck applications
• Built using Industrial Injection's proven engine machining expertise
• Engineered for long-term durability and dependable performance

Ideal For

• DIY engine builders
• Engine rebuild projects
• Stock replacement engines
• Tow rigs
• Daily drivers
• Fleet vehicles
• Commercial work trucks
• Long-term reliability upgrades

Build it yourself with confidence using the same premium machining processes and quality components trusted in Industrial Injection engine builds. The Premium Stock Plus Builder Box provides everything needed to start your LLY Duramax build on a foundation engineered for durability, reliability, and long-term performance.

Note: This is an unassembled short block builder package and does not include fuel system components, turbocharger components, cylinder heads, injectors, or engine accessories.