Brand New LS3 6.2L GM Crate Engine

Complete LS3 Engine Swap Package for Sale, 6.2L Camaro LS3 with Transmission and Harness

Key Features

• Low mileage OEM LS3 engine, under 80,000 miles verified
• Complete pullout assembly including transmission
• Wiring harness and ECU available with package
• Compression tested on every cylinder before shipping
• Intake manifold, accessories, and starter included where applicable
• 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

A Complete LS3 Swap Package at McClain Auto Part

Sourcing an LS swap engine is one thing. Sourcing a complete 6.2 LS3 engine with harness already pulled together is a different proposition entirely. For builders who have done an LS swap before, the appeal of a complete pullout assembly is obvious. For builders doing their first swap, a complete package removes a significant amount of the sourcing headache that comes with piecing together a drivetrain from multiple sources.

At McClain Auto Part we have been sourcing and selling LS engines and complete packages since 2009. The low mileage LS3 engine swap package is one of our most requested performance engine listings and the buyers who come looking for it generally fall into a few categories. Classic muscle car restomod builders who want the most capable naturally aspirated LS engine in a complete ready-to-swap form. Hot rod builders who need a modern performance V8 with a complete control package. Performance replacement buyers whose Camaro SS or Corvette needs a fresh drivetrain. All of them benefit from a complete package rather than hunting individual components across multiple sources.

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 OEM Camaro LS3 engine assembly we ship reflects that approach.

Why the LS3 Is the Right Engine for a Serious Swap

The LS platform has dominated the engine swap world for two decades and shows no signs of slowing down. Within that family the LS3 occupies a specific and highly desirable position. It is not a truck engine adapted for performance use. The LS3 was engineered as a purpose-built performance V8 from the ground up and fitted in the Camaro SS and Corvette C6 from the factory.

The difference between the LS3 and the truck-based LS engines that make up the majority of the used LS market matters to builders who care about the finished result. Rectangular port cylinder heads that flow significantly more air than the cathedral port heads on LM7 and LQ4 truck engines. Higher compression ratio calibrated for premium fuel and performance output. A factory tune built around performance driving rather than fuel economy and towing. The result is approximately 430 horsepower in stock trim from a naturally aspirated V8 that responds well to further modifications.

For hot rod builds, restomod projects, and performance replacements where the goal is a modern high-output V8 in a proven package, the performance 6.2 V8 replacement engine is what most experienced builders reach for first when budget and availability allow.

Technical Specifications

6.2L LS3 Engine Package, General Specifications

• Engine Type: V8, OHV, 2 valves per cylinder
• Displacement: 6.2L, 376 cubic inches
• Configuration: 90 degree V8
• Block Material: Aluminum
• Cylinder Head Port Style: Rectangular port
• Fuel System: Sequential fuel injection, returnless design
• Fuel Type: Premium gasoline recommended
• Horsepower: Approximately 430 HP in Camaro SS application
• Torque: Approximately 424 lb-ft
• Compression Ratio: 10.7:1
• Engine Family: GM LS platform, Gen IV
• Transmission: 6-speed manual or automatic depending on available package
• Factory Applications: Chevrolet Camaro SS 2010 to 2015, Chevrolet Corvette C6 2008 to 2013

Specifications reflect standard Camaro SS application figures. Corvette applications vary slightly. Transmission type depends on the specific pullout package available. Call us to confirm the exact transmission and component configuration currently in stock.

What Is Included in This Package

Because this is a pullout assembly the included components reflect what was present on the donor vehicle at time of removal. The core package typically includes the following:

Standard Package Inclusions

• Complete LS3 engine long block assembly
• Intake manifold
• Fuel injectors
• Valve covers
• Oil pan
• Starter motor
• Alternator where present on donor
• Transmission, manual or automatic depending on available unit
• Wiring harness, engine harness available on most packages
• ECU availability confirmed at time of order

Important Notes on Inclusions

Wiring harness and ECU availability depends on the specific pullout. Not every donor vehicle yields a complete harness in usable condition. We confirm exactly what is present on the specific package we have in stock before you order. If you need a complete standalone harness for a swap application, let us know your intended chassis and we advise on what comes with the package and what you may need to source separately.

Pedal assembly, transmission crossmember, and driveshaft components are not guaranteed inclusions. Confirm your specific requirements when you call.

Condition and Inspection

Every LS3 package we ship goes through a hands-on inspection at our Cleveland facility before it leaves. This is a performance engine and the buyers who order it expect it to perform from day one.

What We Check Before Every Package Ships

• Compression tested on every cylinder with actual numbers recorded
• Full visual inspection of engine block, heads, and external components for cracks, leaks, and damage
• Mileage verified against donor vehicle records
• Rectangular port cylinder heads inspected for cracks and valve seat condition
• Oil passages checked for contamination or sludge
• Coolant passages inspected for signs of internal mixing or head gasket issues
• Timing chain system checked for wear and tensioner condition
• Transmission inspected for fluid condition, case damage, and shift quality where applicable
• No knocking, no ticking, no unusual engine noise confirmed before packaging

The rectangular port heads on the LS3 are one of the things we pay specific attention to. They are more valuable than truck-spec heads and buyers who plan to use them in a build deserve to know their condition accurately. We inspect and document what we find.

LS Swap and Hot Rod Applications

The LS3 engine for hot rod swap projects is one of the most practical ways to approach a serious build. Rather than sourcing a bare engine and then hunting a compatible transmission, harness, and ECU separately from different suppliers and hoping everything works together, a complete pullout gives you components that already functioned as a system.

Common Swap Applications

Classic Camaros, Chevelles, and Novas are natural homes for the LS3. The power output, compact dimensions, and broad GM parts compatibility make the swap straightforward on these platforms with appropriate motor mount adapters and transmission crossmember work.

First generation Broncos, C10 trucks, and other classic GM trucks are popular LS3 swap platforms. The rectangular port heads and performance output of the LS3 make it a step above the more common truck engine swaps in these applications.

Fox body Mustangs, classic Corvettes, and purpose-built hot rods of all configurations use the LS3 regularly. The aftermarket support around this platform is deep enough that whatever the chassis, someone has done the swap before and documented it.

For drift builds the LS3 provides the high-RPM power and throttle response that the application benefits from combined with the broad aftermarket support that makes supporting modifications accessible.

Installation and Fitment Notes

The LS3 pullout motor with transmission simplifies the build significantly but the installation still requires planning and preparation.

Key Considerations

Motor mounts vary by chassis. Factory LS3 mounts from a Camaro application will not drop into most swap chassis without adapter plates or custom fabrication. Verify your intended motor mount solution before the engine arrives.

The LS3 uses a returnless fuel injection system but requires a fuel pump capable of delivering appropriate pressure and volume. Most factory carbureted fuel systems require upgrading for EFI operation.

Cooling system capacity matters on a 430 horsepower naturally aspirated engine. A properly sized radiator and adequate coolant flow are important for long-term reliability particularly in performance driving conditions.

ECU tuning is required for any swap application where the engine is operating outside its factory chassis context. A standalone harness with a pre-programmed tune or a professional tune on the factory ECU is part of any properly executed LS3 swap.

Professional installation is strongly recommended particularly for first-time swap builders. The mechanical work is within the capability of experienced home builders but the electrical integration and ECU tuning components benefit from professional expertise.

Warranty

Every LS3 package we sell comes with a 6-month warranty against internal mechanical defects on the engine. James McClain has been honoring warranty claims since 2009. If the engine develops a covered mechanical failure, contact us. We review the situation and work toward a fair resolution. Replacement, credit, or repair guidance depending on what happened.

Transmission warranty coverage depends on the specific transmission included in the package. Confirm transmission warranty terms when you order.

Shipping

We ship from Cleveland, Ohio to all 50 states. The LS3 package ships on a heavy freight pallet, fully secured and protected for transit. Given the size and weight of a complete engine and transmission package, freight carrier delivery is standard. 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 shipment leaves our facility.

Why Buyers Come to McClain Auto Part

Over 15 years in business. More than 10,000 engines and drivetrain packages shipped to builders, mechanics, and shops 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 package we sell is physically in our Cleveland warehouse, inspected by our team, and ready to ship. When you call us about a complete LS3 swap package you are talking to someone who knows the platform and can give you accurate answers about what is included and what your specific swap application requires.

A builder who sourced an LS3 package from us said: “Ordered the complete LS3 pullout for a first gen Camaro restomod. Engine and transmission arrived well packaged, compression numbers were exactly as quoted, harness was in good shape. Saved me weeks of sourcing individual components. Would absolutely use McClain again for the next build.”

Frequently Asked Questions

Is This a Complete LS3 Swap Package?

Yes. The core package includes the complete engine assembly, transmission, wiring harness where available, and intake manifold with injectors. Exactly what is included depends on the specific pullout we have in stock. Call us before ordering and we confirm every component present on the current package.

Does It Come With the Transmission and Harness?

Transmission is included in this package. Wiring harness availability depends on the specific pullout. We confirm harness condition and completeness before the order is processed. If you need a standalone swap harness we can advise on options for your specific chassis application.

What Vehicles Can This LS3 Fit?

The LS3 fits any vehicle designed around or adapted for the GM LS platform. Factory applications include Camaro SS 2010 to 2015 and Corvette C6 2008 to 2013. Swap applications include classic GM muscle cars, C10 trucks, Fox body Mustangs, hot rods, and custom builds across a wide range of chassis.

How Many Miles Are on the Engine?

Under 80,000 miles, verified from donor vehicle records. Most of our current LS3 inventory comes in lower than that. We give you the exact mileage on the specific package before you order.

Is the Engine Compression Tested?

Yes. Every engine goes through compression testing on all eight cylinders with actual numbers recorded. We check for knocking, ticking, oil contamination, and signs of internal damage before packaging.

Does It Include ECU and Accessories?

ECU availability depends on the specific pullout package. We confirm ECU presence and condition when you call. Accessories including starter, alternator, and intake manifold are typically included. Exactly what is present is confirmed before the order is processed.

Is This Good for Hot Rod or Restomod Builds?

Yes. The LS3 is one of the most popular engines for hot rod and restomod applications specifically because of its rectangular port heads, 430 horsepower output, compact dimensions, and deep aftermarket support. A complete pullout package with transmission and harness gives builders a significant head start on the sourcing process.

Order Your LS3 Swap Package Today

Complete low mileage LS3 packages with transmission and harness do not stay in inventory long. Builders who know what they are looking for move quickly when the right package becomes available.

If you need a complete 6.2L LS3 swap package from a seller who inspects what they sell and gives you accurate information about what is included, call us, email us, or place your order now. We confirm every component, mileage, and fitment detail before anything ships.

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.