Remanufactured GM 6.0L Vortec Engines for Sale (1999–2020)

A thorough visual inspection of each block for casting defects, meticulous disassembly with every part inspected for damage and the cause of failure identified. Oil and water passage plugs are removed to guarantee optimal results during thermal cleaning. Only premium castings are selected — never repaired castings or sleeved blocks on high-performance engines.

Our thermal cleaning system distributes heat evenly through the chamber, avoiding overheating or warping. Components are heated in an oxygen-deficient atmosphere that decomposes combustible hydrocarbons and leaves parts dry. The Ace RKE 230 oven is used exclusively for cast-iron blocks.

Stainless-steel shot removes surface contamination like rust for a smoother finish — vital for detecting surface and subsurface defects — while the peening process imparts compression strength to the metal.

Magnetic particle inspection detects cracks and imperfections in ferrous engine parts, ensuring the highest quality for our cast-iron blocks.

Aluminum blocks first go through the AXE SW20 OS spray cleaning system, whose multi-integrated nozzles remove all foreign material — crucial for a thorough inspection.

Ultrasonic cleaning — the benchmark in cleanliness — reaches inaccessible areas and breaks the bonds holding small particles to surfaces before pressure testing.

The Delta pressure tester double-checks for pinholes after magnafluxing and dye testing, ensuring the integrity of every casting used in our products.

After a complete visual inspection we repair minor casting defects, remove broken bolts, tap threads and perform gasket surface repairs to minimize stock removal.

The RMC CNC V40 enclosed machining center measures and levels blocks and measures deck heights and cylinder bore sizes, eliminating operator error. It determines the Ra finish based on block type and gasket, using CBN cutters and checking surface finish with the Mitutoyo SJ-301.

The Sunnen LBB-1600 hone, accurate to within .0001″, reconditions rods and fits pins so honed bores are equal to or better than new. High-performance engines get ARP high-strength bolts and nuts first.

Rottler’s newest cylinder honing machine finishes cylinders within .0001″ roundness and straightness, continuously analyzing and correcting the bore to hold the critical oil clearances modern engine designs demand.

After precise machining, every block undergoes a second high-pressure wash cycle for absolute cleanliness before final assembly.

All parts are ultrasonically cleaned prior to assembly, reaching every surface and internal area to meet the most stringent cleanliness standards.

Each assembler conducts a thorough visual inspection and measures parts for proper size. Blocks are fitted with new cam bearings, oil restrictors, relief valves and new water and oil plugs; heads are installed with new bolts and gaskets and each cylinder’s seal integrity is checked. A final inspection by our assembly manager signs off every engine.

Check the 8th digit of your VIN: U = LQ4, N = LQ9, K = LY6, G = L96, C = L77 (Caprice PPV). Hybrid LFA / LZ1 and industrial LC8 engines are identified by VIN and application. Use the free VIN decoder or call 800-731-3177 and Fraser will confirm it.

For heavy-duty work the iron-block LQ4 (Gen III) and L96 / LY6 (Gen IV) are the most durable, high-torque choices. The LQ9 adds compression for high-output applications. The “best” engine is the one that matches your VIN — Fraser’s Fraser Advantage™ builds add every TSB update and a 5-year warranty to whichever family your truck uses.

The LQ9 is a higher-compression (about 10:1 vs. 9.4:1) version of the LQ4 with flat-top pistons, rated for more horsepower in Escalade, Silverado SS, Sierra Denali and Vortec Max applications. For towing and fleet duty the LQ4 is every bit as durable; for a performance application the LQ9 is the upgrade. They share the same block and heads, so fitment is determined by your VIN and calibration.

Not as a direct swap. The Gen IV L96 uses a different reluctor wheel (58x vs. 24x), sensors, intake, VVT hardware and PCM calibration than the Gen III LQ4. Fraser supplies the correct generation for your VIN — Options 1–2 for 1999–2006 Gen III trucks and Options 3–5 for 2007–2020 Gen IV.

Yes. Every order is reviewed against the full 17-digit VIN — engine code, model year, emissions equipment, drivetrain and application — before the engine ships.

With proper installation, cooling-system service, break-in and maintenance, a remanufactured 6.0L should deliver a service life comparable to new — well over 100,000 miles, including towing and fleet duty. Fraser backs it with up to a 5-Year / Unlimited-Mile warranty plus No-Fault coverage.

Standard and Fraser Advantage™ builds are matched to your VIN and use your existing PCM / ECM calibration. The DOD / AFM Delete build (Option 5) requires vehicle-specific calibration with a customer-supplied tuner to disable Active Fuel Management, and the delete configuration must be verified for your application.

Yes — qualifying orders ship with no upfront core fee. Your old engine is picked up free from a commercial address after installation; a refundable deposit or core-waiver option applies only where noted on your quote.

Yes. Shipping and core pickup are free to any commercial address in the continental U.S.; residential and liftgate delivery are available. In-stock units typically deliver in 2–3 business days from 27 distribution locations.

Your year, make, model, 17-digit VIN and engine details, plus the delivery address type (commercial or residential). Submit them through Get a Quote in Seconds and a specialist confirms fitment, pricing, availability, warranty and shipping before payment.