GM Duramax 6.6L LB7 Engine

For sale is a GM Duramax 6.6L LB7 Engine, compatible with GMC and Chevrolet HD trucks from model years 2001 to 2004. Whether you’re rebuilding a heavy-duty workhorse, swapping into a custom build, or replacing a failed motor, this GM Duramax 6.6L LB7 Engine is an excellent choice known for its power, reliability, and simplicity.

This engine is either low-mileage OEM or professionally remanufactured (you can tailor this line depending on your actual engine). It’s ready for install or inspection, with all key components intact, and has been carefully maintained or rebuilt to ensure longevity.

Engine Specs – GM Duramax 6.6L LB7 Engine

• Engine Code: LB7

• Displacement: 6.6L / 403 CID

• Configuration: 90° V8 Turbo Diesel

• Fuel System: Bosch Common Rail Direct Injection

• Turbocharger: Garrett Variable Geometry Turbo (VGT)

• Block Material: Cast Iron

• Head Material: Aluminum

• Horsepower: ~300 HP @ 3,100 RPM

• Torque: ~520 lb-ft @ 1,800 RPM

• Compression Ratio: 17.5:1

• Valvetrain: OHV, 32 valves (4 valves per cylinder)

• Fuel Type: Diesel

• Emissions Equipment: No EGR (pre-emissions)

Condition Of The GM Duramax 6.6L LB7 Engine

Fully functional and ready for install
Pulled from a running vehicle / freshly remanufactured
Clean and inspected – no cracks, leaks, or major wear
All mounting points intact
Includes essential components (see below)

This engine was either:

• Professionally remanufactured with new pistons, rings, bearings, gaskets, seals, injectors, and more, or

• OEM with under [insert miles] and has passed compression and oil pressure tests.

(Adjust these based on your specific engine’s history.)

What’s Included GM Duramax 6.6L LB7 Engine

This listing includes the following (depending on your sale, check off what applies):

• Complete long block (block, crank, cam, pistons, heads, valves)

• OEM or reman fuel injectors (Bosch)

• Injection lines

• Intake manifold

• Exhaust manifolds

• Turbocharger

• Oil pan

• Valve covers

• Timing cover

• Front accessory drive (optional)

• Engine harness (optional)

• Engine Control Module (ECM) (optional)

• Flywheel/flexplate (optional)

Let me know if you need any accessories like the alternator, AC compressor, starter, or harness—these can be added for an extra cost if not already included.

Why Choose the GM Duramax 6.6L LB7 Engine?

The GM Duramax 6.6L LB7 Engine is the original generation of the Duramax diesel V8, produced from 2001 to early 2004. It’s widely regarded as one of the simplest and most reliable diesel engines GM ever produced, known for its:

• No EGR, DPF, or DEF systems (pre-emissions)

• Excellent fuel economy for its size and power

• Ability to tow and haul heavy loads with ease

• Reliable performance with proper maintenance

• Easy availability of performance upgrades

Even today, the GM Duramax 6.6L LB7 Engine remains a favorite for diesel enthusiasts due to its durability, tunability, and ease of service.

Common GM Duramax 6.6L LB7 Engine Issues (and Why This Engine is Different)

Like all diesels, the GM Duramax 6.6L LB7 Engine has a few known issues—most notably:

• Injector failure: Factory injectors often fail around 100k–150k miles

• Head gasket wear: Typically a problem beyond 200k miles

• Fuel filter housing leaks

This engine has been updated to address these concerns. Depending on your specific engine, the following might apply:

 Upgraded Bosch SAC00 or SAC45 injectors
 Head gaskets inspected or replaced
 Fuel system cleaned and pressure-tested
Leak-down and compression tested

Fitment / Compatibility

The GM Duramax 6.6L LB7 Engine fits the following models:

• 2001–2004 Chevy Silverado 2500HD / 3500HD

• 2001–2004 GMC Sierra 2500HD / 3500HD

• 2001–2004 Chevy Express 2500 / 3500 (with 6.6 Duramax option)

• 2001–2004 GMC Savana 2500 / 3500

• Custom swaps and off-road vehicles with the correct mounts and harness

Please confirm compatibility with your VIN or mechanic before purchase. This is a VIN “1” engine (8th digit of VIN = “1”).

Warranty / Return Policy Of GM Duramax 6.6L LB7 Engine

• Engine sold as-is, unless otherwise agreed.

• If remanufactured, warranty options may be available (e.g., 12 months / 12,000 miles).

• Returns accepted within 30 days if the engine is unused and in original condition (buyer pays return shipping).

• Buyer is responsible for professional installation, fluids, and proper break-in procedures.

Shipping & Payment Of GM Duramax 6.6L LB7 Engine

• Shipping available nationwide (USA) and Canada.

• Freight shipping to commercial address or terminal.

• Local pickup welcome (message to coordinate).

• Engine will be secured on pallet, shrink-wrapped, and ready to ship.

Price

Asking Price: $8000
(Fair market for LB7 engines ranges between $4,500 and $7,000 depending on condition and accessories.)

Make an offer. Lowballers will be ignored. If you want a reliable, ready-to-go LB7, this engine delivers real value.

Why This Engine is a Great Deal

• OEM or rebuilt GM Duramax 6.6L LB7 Engines are becoming harder to find in good condition.

• This engine is tested, clean, and ready to drop in—no hidden damage or surprises.

• It avoids common failure points thanks to updated components and careful inspection.

• You’re getting a solid engine for less than the cost of a full rebuild or crate engine.

Whether you’re a weekend warrior, a shop owner, or a truck enthusiast, this is your chance to secure a true workhorse diesel engine with decades of reputation behind it.

Q: Does it come with injectors?
A: Yes – either new/reman or OEM injectors are included, depending on what’s stated above.

Q: Can I hear it run or see test results?
A: Absolutely—compression numbers and oil pressure results are available on request. Engine was pulled from a running truck or run on a test stand.

Q: Do you offer install help or tech support?
A: I can provide install guides or advice for serious buyers. Professional installation is always recommended.

Photos

(Include high-quality, well-lit photos of the following):

• Entire engine on pallet

• Close-ups of valve covers, oil pan, turbo

• Injector harness/connectors

• Serial number or VIN stamp

• Compression test (if applicable)

• Accessories included

Closing Statement

If you’re looking for a clean, reliable GM Duramax 6.6L LB7 Engine that’s ready to work, don’t miss this opportunity. With rising demand, fewer clean engines available, and ever-increasing rebuild costs, this engine offers serious performance at a great value.