6.0 lq4 engine

Chevy GMC 6.0L LQ4 Engine for Sale, Used GM Vortec 6.0 V8, Low Mileage

Key Features

• Low mileage unit, under 80,000 miles verified
• Cast iron block construction, built for heavy duty use and boost
• Compression tested on every cylinder before shipping
• No knocking, no ticking, no signs of internal damage
• LS-based Gen III architecture, broad aftermarket support
• 6-month warranty against mechanical defects
• Ships from Cleveland, Ohio to all 50 states on secured freight pallet
• Most orders processed and shipped within 1 to 3 business days

The LQ4 Engine at McClain Auto Part

The Chevy 6.0 LQ4 engine occupies a specific and well-earned position in the GM truck and LS enthusiast world. It is a heavy duty V8 that powered some of the most hard-working trucks and vans GM produced through the early 2000s. Beyond its factory applications, the LQ4 has become one of the most sought-after engines in the LS swap community because of one characteristic that sets it apart from the aluminum block alternatives: the cast iron block.

At McClain Auto Part we have been sourcing and selling used GM engines since 2009. The LQ4 is a consistent seller for us and the buyers who come looking for it generally know exactly what they want. Truck owners who need a reliable replacement for a worn or damaged engine. Fleet operators who need a fast turnaround on a work truck that cannot stay down. LS swap builders who want an iron block foundation for a turbocharged build without paying premium prices for an LS3 or LQ9. We stock verified low mileage units, inspect every one at our Cleveland facility, and back every sale with a 6-month warranty.

James McClain founded this business in 2009 on straightforward principles. Represent what you sell accurately, inspect it properly, and stand behind it after the transaction. Every LQ4 engine for sale we ship reflects that approach.

Why the LQ4 Earns Its Reputation

Spend enough time around LS engines and you develop a clear picture of where each variant fits. The LQ4 is not a performance engine in its factory configuration. It makes around 300 to 325 horsepower and 360 to 370 lb-ft of torque depending on application and model year. Those numbers are honest and appropriate for a heavy duty truck V8 designed for towing and sustained commercial use.

What makes the LQ4 stand out is the combination of iron block durability, 6.0L displacement, and LS platform architecture. The iron block handles heat and mechanical stress differently than aluminum. Under boost, the cast iron construction is more forgiving than aluminum alternatives which is a primary reason turbocharged LS builders gravitate toward it specifically. Builders who want to run significant boost on a budget consistently choose the LQ4 as their foundation.

The 6.0L displacement also gives it a torque advantage over the 5.3L truck engines that are more commonly available in the used market. More displacement means more torque at lower RPM which matters both for towing applications and for turbocharged builds where bottom-end torque is part of the goal.

Engine Specifications

GM 6.0L LQ4 V8, General Specifications

• Engine Type: V8, OHV, 2 valves per cylinder
• Displacement: 6.0L, 364 cubic inches
• Configuration: 90 degree V8
• Block Material: Cast iron
• Cylinder Heads: Aluminum cathedral port heads
• Fuel System: Sequential fuel injection
• Fuel Type: Gasoline
• Horsepower: Approximately 300 to 325 HP depending on application and model year
• Torque: Approximately 360 to 370 lb-ft
• Compression Ratio: 9.4:1 to 10.0:1 depending on year
• Engine Family: GM LS platform, Gen III
• Factory Applications: Chevy Silverado 2500HD, GMC Sierra 2500HD, Chevy Express van, GMC Savana van, Cadillac Escalade select years, Hummer H2

Output figures and compression ratio vary by model year and specific application. Call us with your year and application and we confirm which variant we currently have in stock.

Condition and Inspection

Every used 6.0 LQ4 engine we sell goes through a hands-on inspection at our Cleveland facility. These engines come out of working trucks and vans. We know what high mileage commercial use looks like on an LQ4 and we know what a well-maintained unit looks like when you crack it open.

What We Check Before Every LQ4 Ships

• Compression tested on every cylinder with actual numbers recorded
• Full visual inspection of the block, heads, and external components for cracks, leaks, and damage
• Mileage pulled and verified against donor vehicle records
• Valley cover inspected on select units for sludge and contamination
• Oil passages checked for signs of neglected maintenance
• Coolant passages inspected for signs of head gasket issues
• Timing chain and tensioners checked for wear
• No knocking, no ticking, no unusual engine noise confirmed before packaging

An LQ4 that comes out of a fleet van with 200,000 miles of hard use looks very different from one that came out of a privately owned Silverado 2500 with documented service history. We know the difference and we only ship the ones that pass.

Vehicle Compatibility

Common Factory Applications

The GM 6.0L LQ4 was factory-fitted in the following vehicles:

• Chevrolet Silverado 2500HD, 2001 to 2007
• GMC Sierra 2500HD, 2001 to 2007
• Chevrolet Express 2500 and 3500 vans, 2001 to 2007
• GMC Savana 2500 and 3500 vans, 2001 to 2007
• Cadillac Escalade EXT and ESV, select years
• Hummer H2, 2003 to 2007
• Chevrolet Suburban 2500, select years
• GMC Yukon XL 2500, select years

Fitment depends on your specific year, trim, and configuration. Call us with your VIN before ordering and we confirm the right unit for your vehicle. For swap applications, confirm your intended chassis requirements and we advise accordingly.

The LQ4 for LS Swaps and Performance Builds

The LS swap community has a specific appreciation for the LQ4 that goes beyond its factory role as a heavy duty truck engine. For builders planning a turbocharged LS swap the iron block is not just a preference, it is often a deliberate choice.

Cast iron handles boost pressure and the thermal expansion that comes with forced induction differently than aluminum. Builders running 600 to 700 horsepower turbo builds on iron block LQ4 engines are well documented in the LS community. The bottom end holds up under those conditions with proper supporting modifications in a way that gives builders confidence that an aluminum block alternative at the same power level requires more careful management to achieve.

Beyond boost applications the LQ4 works well in drift builds, project trucks, rat rods, and any application where a strong, affordable LS-based V8 is the goal. The cathedral port heads that come on the LQ4 are not the highest flowing LS heads available but they work well in stock trim and respond to head swaps for builders who want to take the build further.

The cost advantage of the LQ4 over aluminum block LS platforms like the LS3 is significant in the used market. For a builder who plans to add forced induction anyway, the iron block LQ4 often makes more financial and practical sense than a more expensive aluminum alternative.

Warranty

Every 6.0L LQ4 engine we sell comes with a 6-month warranty against internal mechanical defects. James McClain has been honoring warranty claims since 2009. If something fails that is covered, contact us. We review the situation and work toward a fair resolution. Replacement engine, credit, or repair guidance depending on what happened.

We are not looking for technicalities to get out of a legitimate claim. If the engine failed because of something on our end, we own it.

Shipping

We ship from Cleveland, Ohio to all 50 states. The LQ4 ships on a freight carrier due to engine weight, fully palletized, strapped down, and protected for transit. Most orders are processed and ready to ship within 1 to 3 business days after confirmation.

You receive a tracking number as soon as the engine leaves our facility.

Why Buyers Come to McClain Auto Part

Over 15 years in business. More than 10,000 engines shipped to mechanics, fleet operators, shops, and builders across the country. Rated 4.9 out of 5 stars across 800+ verified Google reviews. Founded by James McClain in Cleveland, Ohio in 2009.

We are not a listing service. Every engine we sell is physically in our Cleveland warehouse, inspected by our team, and ready to ship. When you call us about a used LQ4 engine you are talking to someone who has handled these engines and can give you a direct, accurate answer.

A shop owner who orders from us regularly said: “Bought two LQ4 engines from McClain for fleet Silverado 2500s over the past two years. Both showed up with the mileage they quoted, ran clean from startup, no issues from either install. That consistency is what keeps me coming back.”

Frequently Asked Questions

What Vehicles Use the LQ4 Engine?

The LQ4 was factory fitted in the Silverado 2500HD, Sierra 2500HD, Chevy Express and GMC Savana vans, Hummer H2, and select Cadillac Escalade and Suburban 2500 models primarily from 2001 to 2007. Call us with your year and application to confirm.

Is the Engine Compression Tested?

Yes. Every LQ4 we sell goes through compression testing on all eight cylinders with actual numbers recorded before shipping. We check for knocking, ticking, and oil contamination as part of the same process.

Is the LQ4 Good for Turbo Builds?

It is one of the better choices for budget turbocharged LS builds specifically because of the cast iron block. The iron construction handles boost pressure and heat differently than aluminum alternatives. Builders regularly run significant power on iron block LQ4 engines with proper supporting modifications.

How Many Miles Are on the Engine?

Under 80,000 miles, verified from donor vehicle records. Most of our current LQ4 inventory comes in lower than that. We give you the exact mileage on the specific unit before you order.

What Is Included With the Engine?

Most units include the long block, intake manifold, fuel injectors, valve covers, and oil pan. Wiring harness and ECU are not included unless specifically confirmed at time of order. Call us before ordering and we tell you exactly what is included on the specific engine we have in stock.

Does It Come With Accessories or Wiring?

Wiring harness, ECU, sensors, and accessory drive components are not included unless confirmed at time of order. If you need specific accessories for your application, let us know when you call and we tell you what is available on the current unit.

Ready to Order Your LQ4 Engine?

Clean low mileage LQ4 engines move consistently. Truck owners who need a reliable replacement and builders sourcing an iron block LS foundation both come to us for this engine regularly.

If you need a used 6.0 LQ4 engine from a seller who knows the platform and inspects what they sell, call us, email us, or place your order now. We confirm mileage, fitment, and exactly what is included before anything ships. Most orders leave our Cleveland warehouse within 1 to 3 business days.

McClain Auto Part. Cleveland, Ohio. In business since 2009. 10,000+ engines shipped. 4.9 stars on Google. 6-month warranty on every engine we sell.