Industrial Injection 2004.5-2005 GM Duramax LLY 6.6L Stage 2 Long Block Engine
Can I pick up my order or have it installed at your shop?
Can I pick up my order or have it installed at your shop?
Absolutely. We offer local pickup on most products and full professional installation at our shop in Washington, MO. Whether you just want to grab your parts or have our techs handle the install, we’ve got you covered. Give us a quick call at 636-429-7020 or message us to schedule a visit — we’ll make sure the parts are ready when you arrive.
How do I know if this part fits my vehicle?
How do I know if this part fits my vehicle?
Unsure if it’ll fit? No problem — that’s what we’re here for. Send us your vehicle’s year, make, and model, and we’ll verify fitment before you order. We can also point you toward compatible upgrades or supporting parts if needed.
What if I need to return a product or it’s defective?
What if I need to return a product or it’s defective?
Most unused items can be returned within 30 days in their original packaging. Some products are covered by a manufacturer’s warranty as well. If something arrives damaged or doesn’t meet your expectations, just let us know — we’ll help you get it replaced, refunded, or repaired. (Tracking updates are also emailed automatically once your order ships.)
What's the lead time on custom or fabricated parts?
What's the lead time on custom or fabricated parts?
Many of our parts are built to order — especially fabricated or performance components. These can take additional time to produce before shipping. Lead times vary by manufacturer and demand, but we’ll always keep you updated along the way. If you’re working on a tight schedule, reach out before ordering at 636-429-7020 and we’ll confirm current availability or estimated ship dates.
Description
Description
Take your 2004.5-2005 GM Duramax LLY 6.6L to the next level with the Industrial Injection Stage 2 Long Block Engine. Built for high-horsepower street trucks, drag racing, sled pulling, and competition applications, this performance long block is precision machined, balanced, blueprinted, and assembled with premium components designed to handle serious power while maintaining durability and reliability. MPN: PDM-LLYRLB.
Why Choose the Industrial Injection Stage 2 Long Block Engine?
- Built for High Horsepower Applications – Designed for demanding street, racing, sled pulling, and competition environments.
- Balanced & Blueprinted Assembly – Precision-machined rotating assembly helps deliver smooth operation and durability under high horsepower conditions.
- Reinforced Bottom End – Features Industrial Injection X Series pistons, Wagler HD forged connecting rods, a 14mm Gorilla Girdle, and ARP main studs for increased strength.
- CNC Ported Cylinder Heads – Fully ported and polished cylinder heads improve airflow consistency and cylinder filling potential.
- Billet Alternate Firing Camshaft – Includes a keyed billet alternate firing camshaft designed for high-performance reliability.
- Competition-Ready Construction – Each engine is simulation tested and quality inspected before shipment.
- Industrial Injection Engine Expertise – Built with premium performance components and proven engine-building processes.
Kit Includes
- Fully assembled LLY Duramax Stage 2 long block
- CNC Ported & Polished cylinder heads
- Industrial Injection X Series coated, chamfered, and de-lipped 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
Installation Highlights
The Industrial Injection Stage 2 Long Block arrives fully assembled and ready for performance use. Additional assembly gaskets, fuel system components, turbocharger components, injectors, exhaust manifolds, engine accessories, and break-in oil are not included.
Fits These Models
- 2004.5-2005 Chevrolet Silverado 2500HD 6.6L Duramax LLY
- 2004.5-2005 Chevrolet Silverado 3500HD 6.6L Duramax LLY
- 2004.5-2005 GMC Sierra 2500HD 6.6L Duramax LLY
- 2004.5-2005 GMC Sierra 3500HD 6.6L Duramax LLY
Specifications
- Engine Platform: GM Duramax LLY 6.6L
- Year Range: 2004.5-2005
- Application: High-performance street and competition use
- Crankshaft: Balanced and keyed OEM Duramax crankshaft
- Camshaft: Keyed billet alternate firing camshaft
- Valve Springs: 130 lb valve springs installed
- Cylinder Heads: Fully CNC ported and polished using 5-axis CNC machining
Key Features at a Glance
- Stage 2 Performance Build - Designed for enthusiasts requiring more than a stock replacement engine.
- Forged Internal Components - Provides increased strength for demanding horsepower applications.
- CNC Ported Cylinder Heads - Improves airflow and horsepower potential.
- 14mm Gorilla Girdle Reinforcement - Strengthens the bottom end under extreme cylinder pressures.
- Fully Assembled Long Block - Ready for performance installation.
- Simulation Tested - Quality inspected before shipment.
Notes
- MPN: PDM-LLYRLB
- SKU: PDM-LLYRLB
- Optional billet crankshaft upgrade available.
- Not included: additional assembly gaskets, fuel system components, turbocharger components, injectors, exhaust manifolds, engine accessories, and break-in oil.
SKU: PDM-LLYRLB
Questions? We’re Here to Help.
Have questions about upgrades for your Duramax? Contact FASS Motorsports and we’ll get you dialed:
Phone: 636-429-7020
Email: info@fassmotorsports.com
