Remanufactured Duramax LBZ 6.6L Engine For Sale
2006–2007 — 360 hp @ 3,200 RPM | 650 lb-ft @ 1,600 RPM
The Duramax LBZ is widely considered the most desirable Duramax generation ever produced. With 360 horsepower and 650 lb-ft of torque, it was the most powerful Duramax at its release. More importantly...
Starting from $7,000 – $10,000 — 1-Year Unlimited Mileage Warranty
Duramax LBZ Technical Specifications
About the Duramax LBZ Engine
The Duramax LBZ is widely considered the most desirable Duramax generation ever produced. With 360 horsepower and 650 lb-ft of torque, it was the most powerful Duramax at its release. More importantly, the LBZ was the last generation produced before the DPF (Diesel Particulate Filter) mandate, giving it the perfect combination of strong power, proven reliability, and a relatively simple emissions system. The LBZ was also the first Duramax paired with the Allison 1000 6-speed automatic transmission, further improving towing capability and fuel economy.
Duramax LBZ Strengths
- Most powerful pre-DPF Duramax at 360 hp / 650 lb-ft
- Last generation without DPF — no regeneration cycles or clogged filters
- First Duramax with Allison 6-speed automatic — better towing and fuel economy
- Strongest factory rotating assembly of the early Duramax engines
- Excellent aftermarket support — responds extremely well to tuning
- Premium resale value due to high demand
- Proven reliability with many engines exceeding 400,000 miles
Common Duramax LBZ Issues (Addressed in Our Remanufactured Engines)
- EGR system can cause carbon buildup (less severe than LLY)
- Injector harness chafing on early production units
- Transfer case issues on some 4WD models (not engine-related)
- High demand means higher prices on the used market
Vehicles with the Duramax LBZ
Available Duramax LBZ Remanufactured Engines
Duramax LBZ Buying Guide
The LBZ commands a premium due to its reputation. When purchasing a remanufactured LBZ, verify the engine serial number matches the LBZ designation — some sellers mislabel LLY or LMM engines as LBZ. The LBZ is identified by VIN code 'D' in the 8th position. A quality remanufactured LBZ should include updated injector harnesses, a cleaned EGR system, and verified CP3 fuel pump. The LBZ was only produced for about 18 months (mid-2006 to mid-2007), making it the shortest production run of any Duramax generation.
Frequently Asked Questions — Duramax LBZ
How much does a remanufactured Duramax LBZ engine cost?
A remanufactured Duramax LBZ 6.6L engine typically costs between $7,000 and $10,000. The LBZ commands a premium over other Duramax generations due to its reputation as the most desirable variant. All our LBZ engines are verified by serial number and include a comprehensive warranty. Call (631) 991-7700 for a quote.
Why is the Duramax LBZ so popular?
The LBZ is the most sought-after Duramax because it combines strong power (360 hp / 650 lb-ft), the Allison 6-speed transmission, and a pre-DPF emissions system. It's the last Duramax you can own without dealing with DPF regeneration cycles, DEF fluid, or the associated maintenance costs. It also responds extremely well to aftermarket tuning.
What years is the Duramax LBZ?
The Duramax LBZ was produced from mid-2006 through mid-2007, making it the shortest production run of any Duramax generation (approximately 18 months). It was installed in 2006-2007 Chevrolet Silverado 2500HD/3500 and GMC Sierra 2500HD/3500 trucks.
Is the LBZ or L5P Duramax better?
It depends on your priorities. The L5P (2017+) is significantly more powerful (445 hp / 910 lb-ft) and more refined, but requires DEF and has a DPF. The LBZ (360 hp / 650 lb-ft) is simpler, easier to modify, and has no DPF/DEF. For a daily driver or tow vehicle, the L5P is superior. For a work truck or project build, many prefer the LBZ's simplicity.
How can I tell if my truck has an LBZ Duramax?
Check the 8th digit of your VIN — the LBZ uses code 'D'. The LBZ was produced from mid-2006 to mid-2007. If your truck is a 2006 model, it could be either an LLY (VIN code '2') or LBZ (VIN code 'D'). The engine serial number on the block will also confirm the generation.
How many miles will a Duramax LBZ last?
A well-maintained Duramax LBZ can last 400,000 to 500,000+ miles. The LBZ has the strongest factory rotating assembly of the early Duramax engines and benefits from a simpler emissions system. Many LBZ trucks used for towing have exceeded 400,000 miles with regular maintenance.
Duramax Troubleshooting Guides
Duramax Problems Guide
LB7 injectors, LBZ head gaskets, LML DEF issues — all generations covered.
Read Guide →Diesel Engine Cost Guide
Complete pricing for remanufactured Duramax engines by generation.
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Read Guide →Installation Guide
Step-by-step guide for installing your remanufactured engine.
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