GM / Chevy 6.0L Reman Engines & Replacement Engine Guide

LY6 · Gen IV In stock

LY6 · Gen IV replacement

2007-2008 GM 6.0L LY6 VIN K Reman Engine | VVT, No AFM

Displacement6.0L

WarrantyManufacturer-backed limited warranty

$2,670.00 + $650 refundable core

L76 · Gen IV In stock

L76 · Gen IV replacement

2007-2008 GM 6.0L L76 VIN Y Reman Engine | VVT & AFM

Displacement6.0L

WarrantyManufacturer-backed limited warranty

$2,890.00 + $800 refundable core

LQ4 · Gen III In stock

LQ4 · Gen III replacement

2005-2007 GM 6.0L LQ4 VIN U Reman Engine | Truck & Hummer

Displacement6.0L

WarrantyManufacturer-backed limited warranty

$2,615.00 + $550 refundable core

LQ9 · Gen III In stock

LQ9 · Gen III replacement

THE GOAT GM 6.0L Reman Engine Assembly for 2002-2006 LQ9 Escalade, Sierra, Silverado

Displacement6.0L

WarrantyManufacturer-backed limited warranty

$2,560.00 + $550 refundable core

LQ4 · Gen III In stock

LQ4 · Gen III replacement

2001-2004 GM 6.0L LQ4 VIN U Reman Engine | Truck & SUV

Displacement6.0L

WarrantyManufacturer-backed limited warranty

$2,560.00 + $550 refundable core

GM 6.0L In stock

GM 6.0L replacement

1999-2000 GM 6.0L VIN U Reman Engine | Cast Head

Displacement6.0L

WarrantyManufacturer-backed limited warranty

$2,280.00 + $450 refundable core

GM 6.0L buyer guide

The GM 6.0L family is more than one LS truck engine

The active catalog runs from early VIN U 6.0L truck/SUV applications through LQ4, LQ9, L76, LY6 and L96 engines, plus a completely separate pair of 366-cubic-inch medium-duty Mark V/VI long blocks.

LS-family displacement364 CID / 6.0L

LS bore × stroke4.000 × 3.622 in

Key codesLQ4 · LQ9 · L76 · LY6 · L96

VIN codes hereU · N · Y · K · G

Coverage1991–2018

Gen III: LQ4 and LQ9 truck/SUV 6.0L engines

The LQ4 and LQ9 group covers the familiar early LS-based 6.0L truck and SUV era. The current catalog identifies LQ4 as VIN U and LQ9 as VIN N, with LQ9 products specifically covering Escalade, Sierra and Silverado applications.

Chevrolet’s historical service material lists LQ4 VIN U and LQ9 VIN N together as 6.0L / 364-cubic-inch engines using a 4.000-inch bore and 3.622-inch stroke. The replacement still has to match the original VIN/engine code and application hardware.

Gen IV: L76, LY6 and L96

The 2007-and-later products introduce the most important hardware split on this page. The source catalog lists L76 as an aluminum-block/aluminum-head VIN Y engine with VVT and DOD/AFM, while LY6 is a cast-block/aluminum-head VIN K engine with VVT and no DOD/AFM.

L96 then becomes the later heavy-duty workhorse in this catalog. Chevrolet Performance identifies L96 as a Gen IV 6.0L small-block V8 with a cast-iron block and aluminum rectangular-port heads.

Application chart

GM 6.0L application chart: LQ4, LQ9, L76, LY6, L96 & 366

Year/Make/Model narrows the catalog, but the final match can still depend on VIN code, engine code, block material, AFM/DOD, VVT and whether an Express/Savana application is a standard van or cutaway chassis.

Engine / VIN	Years	Family	Block / heads	Application note	Core	Price
Early 6.0L · VIN U	1999–2000	Gen III-style truck 6.0	Cast-head configuration	Truck / SUV · oil pan + front cover included	$450	—	Shop →
LQ4 · VIN U	2001–2004	Gen III 6.0L	Aluminum heads	Truck / SUV / Hummer · oil pan + front cover included	$550	—	Shop →
LQ9 · VIN N	2002–2006	Gen III high-output 6.0L	Application-specific LQ9	Escalade / Sierra / Silverado · oil pan + front cover included	$550	—	Shop →
LQ4 · VIN U	2005–2007	Gen III 6.0L	Aluminum heads	Truck / SUV / Hummer · oil pan + front cover included	$550	—	Shop →
L76 · VIN Y	2007–2008	Gen IV 6.0L	Aluminum block + aluminum heads	VVT + DOD/AFM · truck/SUV/Express Van	$800	—	Shop →
LY6 · VIN K	2007–2008	Gen IV 6.0L	Cast block + aluminum heads	VVT · NO DOD/AFM · truck/SUV/Express Van	$650	—	Shop →
L96 · VIN K/G	2009–2016	Gen IV 6.0L	Cast block + aluminum heads	HD truck/Suburban 2500/Express-Savana van · not cutaway on 2010–2016 van path	$650	—	Shop →
L96 · VIN G	2011–2018	Gen IV 6.0L	Cast block + aluminum heads	HD truck/Suburban 3500/Express-Savana cutaway chassis	$650	—	Shop →
366 Mark V	1991–1995	366 CID medium-duty 6.0L	Mark V	10-bolt front-cover bosses · gasket kit/oil pump	$350	—	Shop →
366 Mark VI	1996–2000	366 CID medium-duty 6.0L	Mark VI	6-bolt front-cover bosses · gasket kit/oil pump	$350	—	Shop →

Engine-code reference

LQ4 vs LQ9 vs L76 vs LY6 vs L96

These five codes are the core of the modern GM 6.0L replacement catalog. The code is more useful than the generic “6.0” badge when you are trying to buy the correct long block or engine assembly.

GEN III · LQ4

VIN U truck / SUV / Hummer

The active catalog covers 2001–2004 and 2005–2007 LQ4 application groups. Both are stock-style complete-application assemblies with oil pan and front cover noted.

LQ4 · VIN U · GEN III

GEN III · LQ9

VIN N Escalade / Sierra / Silverado

The current LQ9 product covers 2002–2006 applications and stays separate from LQ4 even though both are LS-based 6.0L Gen III engines.

LQ9 · VIN N · 364 CID

GEN IV · L76

Aluminum block + VVT + DOD/AFM

The 2007–2008 L76 catalog product is VIN Y and specifically calls out an aluminum block, aluminum heads, VVT and DOD/AFM.

L76 · VIN Y · VVT · AFM

GEN IV · LY6

Cast block + VVT, no DOD/AFM

The 2007–2008 LY6 product is VIN K with a cast block, aluminum heads and VVT, but the source explicitly says no DOD/AFM.

LY6 · VIN K · VVT · NO AFM

GEN IV · L96

Heavy-duty truck / van 6.0L

The later L96 products cover Silverado/Sierra HD, Suburban/Yukon heavy-duty and Express/Savana applications. Standard-van and cutaway-chassis fitment are intentionally separated.

L96 · VIN K/G · HD APPLICATIONS

VIN and hardware reference

Why the VIN code and hardware matter on a GM 6.0L

Some of the most confusing 6.0L products overlap in the same model years. The source catalog gives us clean identifiers that should be checked before checkout.

VIN ULQ4 / early 6.0

Early Gen III truck/SUV path

Used in the current catalog on the 1999–2000 early assembly and 2001–2007 LQ4 families.

VIN NLQ9

Escalade / Sierra / Silverado LQ9 path

The dedicated 2002–2006 LQ9 product is separated from the LQ4 listings despite the shared 6.0L displacement.

VIN YL76

Aluminum block with VVT + AFM/DOD

This is the 2007–2008 L76 path in the source catalog.

VIN KLY6 / early L96

Cast-block heavy-duty path

Used by the LY6 product and part of the later L96 application group. Always confirm the engine code, not only the VIN character.

VIN GL96

Later L96 applications

The source catalog uses VIN G across later heavy-duty truck, Suburban/Yukon and cutaway-chassis L96 fitment.

VANStandard vs cutaway

Express / Savana chassis matters

The 2009–2016 L96 product specifically excludes cutaway on the later van path, while the 2011–2018 product specifically covers cutaway chassis.

Legacy medium-duty 6.0L

GM 366 Mark V / Mark VI engines are a separate 6.0L family

The catalog also contains two 366-cubic-inch medium-duty long blocks. They share the “6.0L” displacement label with LS-based engines but are not part of the LQ/Gen IV family.

366 · MARK V

1991–1995 medium-duty long block

The source identifies this as a 366 CID / 6.0L Mark V application with 10-bolt front-cover bosses and a gasket kit/oil pump configuration.

1991–1995 · 10-BOLT FRONT COVER BOSSES

366 · MARK VI

1996–2000 medium-duty long block

The later Mark VI version is identified by 6-bolt front-cover bosses and should be matched to the original medium-duty engine before ordering.

1996–2000 · 6-BOLT FRONT COVER BOSSES

The normal Year/Make/Model finder focuses on the catalog’s passenger/light-truck/SUV/van 6.0L applications. Use the Mark V/VI product details or fitment support for the 366 medium-duty products.

Common replacement considerations

What to investigate before replacing a GM 6.0L

These are practical replacement-engine checks rather than a diagnosis of a specific vehicle.

01

Wrong engine code

LQ4, LQ9, L76, LY6 and L96 should not be treated as interchangeable simply because each displaces 6.0 liters.

02

AFM/DOD mismatch

The source specifically distinguishes L76 with DOD/AFM from LY6 without DOD/AFM. Match the original control/hardware configuration.

03

Wrong block material

Gen IV products on this page include both aluminum-block and cast-block engines. Verify engine code and VIN before ordering.

04

VVT / timing-system condition

Later 6.0L engines use variable valve timing. If the original failure involved timing or oil-pressure issues, correct the root cause before installation.

05

Van vs cutaway-chassis mismatch

L96 Express/Savana products are separated by standard-van and cutaway-chassis fitment in the source catalog.

06

Unresolved cooling, oiling or fuel problem

Correct contamination, overheating, oil-pressure, injector or control-system failures before starting the replacement engine.

Before installation

GM 6.0L replacement-engine install checklist

Confirm the engine family and chassis before the crate is opened, then plan transfer parts and correct the original failure.

01

Confirm engine code and VIN

Start with LQ4/LQ9/L76/LY6/L96 and the VIN character shown for the product.

02

Verify block and AFM/VVT hardware

Especially important when comparing L76, LY6 and later L96 applications.

03

Check van chassis type

Confirm standard Express/Savana van versus cutaway chassis on the L96 products.

04

Plan transfer components

Review intake, accessories, sensors, harness, exhaust, flexplate/flywheel and application-specific external hardware.

05

Fix the original failure

Correct oiling, cooling, timing, fuel and control-system problems before first start.

06

Keep the correct core

Current refundable core deposits range from $350 to $800 depending on the 6.0L product.

Why GOAT GM 6.0L

Built around the GM 6.0L differences that actually change fitment

GOAT separates the major 6.0L engine-code families instead of treating every 6.0 as interchangeable. That matters when LQ4/LQ9, L76/LY6 and L96 hardware overlap by year but use different blocks and control systems.

01

Engine-code-driven fitment

LQ4, LQ9, L76, LY6 and L96 are separated instead of being treated as one generic “6.0 LS” product.

02

Dynamic core deposits

Each product card reads its own Core Fee tag, keeping $350, $450, $550, $650 and $800 deposits tied to the correct engine.

03

Catalog-based Year/Make/Model

The normal vehicle finder uses GOAT application data rather than an external model API.

04

Legacy 366 separated clearly

The two Mark V/VI 366 products remain discoverable for SEO and customers without being mixed into the LS-family fitment flow.

How it works

From GM 6.0L identification to installation in four steps

Use the vehicle finder to narrow the application, verify VIN and engine code, order the matching reman engine, then complete the product-specific core return after installation.

01

Find the vehicle

Use Year/Make/Model or the VIN decoder to narrow the active GM 6.0L catalog.

02

Verify the engine

Confirm engine code, VIN character, block material, AFM/VVT status and chassis configuration.

03

Crate & ship

The matching reman engine ships by freight. Inspect the shipment and document visible damage immediately.

04

Install & return core

Follow the supplied installation requirements and return the correct rebuildable core under the product-specific program.

GM 6.0L tech guides

Research the engine code before checkout

Use GOAT’s engine guides to compare LS-family generations, understand AFM/VVT differences, prepare for installation and research related GM engine families.

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