LS3 Engine for Sale: Ultimate Buyer’s Guide to the Legendary GM V8

The LS3 engine is one of General Motors’ most popular and high-performance V8 engines, widely used in both factory-built performance cars and custom builds. With impressive power, reliability, and modding potential, the LS3 engine has become a go-to choice for enthusiasts across the globe. Whether you’re restoring a classic, upgrading your hot rod, or building a race car, finding an LS3 engine for sale can be the beginning of an exhilarating journey.

In this comprehensive guide, we’ll explore the LS3 engine in depth—its specs, performance, applications, pricing, where to buy, and much more.

What Is the LS3 Engine?
LS3 Engine Specs
LS3 vs Other LS Engines
LS3 Engine Applications
Buying an LS3 Engine: New vs Used vs Remanufactured
Where to Find LS3 Engines for Sale
Price Range for LS3 Engines
LS3 Engine Swaps: What You Need to Know
LS3 Crate Engine Options from GM
Performance Upgrades and Modding Potential
Installation Tips and Challenges
LS3 Engine for Sale: Red Flags to Watch Out For
Best Places to Buy LS3 Engines Online
Customer Reviews and Testimonials
Conclusion

1. What Is the LS3 Engine?

The LS3 engine is a 6.2-liter V8 small-block engine developed by General Motors. It was first introduced in the 2008 Chevrolet Corvette and quickly found its way into other high-performance GM vehicles like the Camaro SS and Pontiac G8 GXP.

Known for its balance of raw power, reliability, and affordability, the LS3 has become a staple in the automotive aftermarket scene. It is often sold as a crate engine for enthusiasts looking to do an engine swap or custom build.

2. LS3 Engine Specs

Here are the core specifications of the GM LS3 engine:

Specification	Details
Displacement	6.2 Liters (6162cc)
Configuration	V8
Bore x Stroke	103.25 mm x 92 mm
Compression Ratio	10.7:1
Horsepower	430–436 hp @ 5900 rpm
Torque	424–428 lb-ft @ 4600 rpm
Fuel System	Sequential Fuel Injection
Redline	~6600 rpm
Block Material	Cast Aluminum
Head Material	Aluminum

3. LS3 vs Other LS Engines

LS3 vs LS1

LS3 has more horsepower and torque than LS1.
LS3 features larger displacement and improved airflow.
LS3 supports higher RPMs and offers better tuning potential.

LS3 vs LS6

LS6 is lighter and revs higher, but LS3 has more low-end torque.
LS3 benefits from newer generation improvements and parts availability.

LS3 vs LS7

LS7 is a 7.0L powerhouse with more top-end power.
LS3 is more affordable, widely available, and better suited for street builds.

4. LS3 Engine Applications

The LS3 engine was installed in several GM vehicles including:

2008–2013 Chevrolet Corvette (C6)
2010–2015 Chevrolet Camaro SS
2009 Pontiac G8 GXP
Chevrolet SS Sedan
Various Holden HSV models (Australia)

Its popularity extends beyond factory applications. You’ll find the LS3 swapped into:

Classic muscle cars (Chevelle, Nova, Camaro)
Trucks and SUVs
Drift cars
Kit cars (e.g., Factory Five)
Off-road builds

5. Buying an LS3 Engine: New vs Used vs Remanufactured

New LS3 Crate Engine

Factory fresh from GM or authorized sellers.
Includes warranty.
Costs more upfront but offers peace of mind.

Used LS3 Engine

Budget-friendly.
Ideal for DIYers with experience.
No warranty—risk of internal damage or wear.

Remanufactured LS3 Engine

Rebuilt to OEM or better standards.
Middle ground between new and used.
Often includes short-term warranty.

6. Where to Find LS3 Engines for Sale

Online Retailers

Chevrolet Performance
Summit Racing
JEGS
Texas Speed & Performance
eBay Motors
Facebook Marketplace

Local Options

Junkyards (search for late-model Camaros and Corvettes)
Performance shops
Engine rebuilders

7. Price Range for LS3 Engines

Condition	Price Range (USD)
New Crate Engine	$7,500 – $12,000
Used LS3 Engine	$3,000 – $6,500
Remanufactured Engine	$5,000 – $9,000

Pricing depends on mileage, included components (ECU, harness), and shipping.

8. LS3 Engine Swaps: What You Need to Know

Swapping an LS3 into a vehicle involves several steps:

Mounting kits (specific to the chassis)
ECU and wiring harness
Transmission compatibility (often T56 or 4L80E)
Cooling system upgrade
Fuel system upgrades
Custom exhaust

The swap is easiest in RWD applications with ample engine bay space.

9. LS3 Crate Engine Options from GM

GM Performance Parts offers the LS3 in several configurations:

1. LS3 430 HP Crate Engine

Basic version.
Includes intake manifold, throttle body, injectors.

2. LS376/480

Upgraded camshaft.
495 HP peak output.

3. Connect & Cruise Packages

Bundled with transmission, ECU, and harness.
Plug-and-play swap solution.

10. Performance Upgrades and Modding Potential

The LS3 is highly mod-friendly. Popular upgrades include:

Camshaft kits (for more aggressive timing and lift)
Forced induction (turbo or supercharger kits)
Intake and exhaust upgrades
Cylinder head porting
Fuel injector upgrades

With proper upgrades, LS3s can reliably make 600–800 HP.

11. Installation Tips and Challenges

Tips

Use reputable swap kits.
Make sure your fuel system supports EFI.
Dyno tune post-installation for optimal performance.

Challenges

ECU programming can be tricky for beginners.
Clearance issues in smaller engine bays.
Emissions compliance (depending on location).

12. LS3 Engine for Sale: Red Flags to Watch Out For

When browsing listings:

Avoid engines with no compression test results
Watch for signs of overheating
Check VIN and engine codes for authenticity
Avoid sellers with no reputation or reviews
Beware of deals that are “too good to be true”

13. Best Places to Buy LS3 Engines Online

Top-Rated Online Sellers:

Chevrolet Performance
- Official source for new crate LS3 engines.
Summit Racing Equipment
- Offers both new and remanufactured options.
Texas Speed & Performance
- High-performance builds and pre-configured crate engines.
JEGS
- Wide inventory with shipping and warranty options.
eBay Motors
- Extensive selection of used engines—buyer protection available.

14. Customer Reviews and Testimonials

Verified Buyers Speak:

“Installed an LS3 crate in my ’68 Camaro. With a mild cam and headers, I’m making 480whp. Smooth powerband and reliable as stock. Worth every penny.”
— Mike G., California

“Got a used LS3 from a wrecked 2010 Camaro SS. Compression was solid, and it dropped into my G-body with Holley mounts. Love it!”
— Sam T., Texas

“The Connect & Cruise package made my swap almost plug-and-play. It’s expensive, but I saved time and headaches.”
— Ryan P., Florida

15. Conclusion

The LS3 engine represents one of the best values in the performance engine market today. It’s powerful, reliable, and incredibly versatile. Whether you choose a brand-new GM crate engine or a budget-friendly used motor, the LS3 can breathe new life into your project car.

From muscle car restorations to custom hot rods, the LS3 is the modern V8 that delivers serious performance with proven reliability. Ready to buy? With so many trusted suppliers, your dream build is just an engine swap away.

Frequently Asked Questions (FAQs)

Q1: How much horsepower can a stock LS3 handle?

A stock LS3 can typically handle around 600–650 horsepower with bolt-ons or mild boost. For more power, internal upgrades are recommended.

Q2: Can I use an LS3 in my classic car?

Yes! The LS3 is a popular swap for classics like the Camaro, Chevelle, and C10. Aftermarket support makes the swap easier than ever.

Q3: What transmission pairs well with the LS3?

The LS3 pairs well with Tremec T56 manual or 4L80E automatic transmissions. GM also offers transmission packages in their Connect & Cruise kits.

Q4: Is the LS3 engine legal for road use in California?

Only if installed in a CARB-approved configuration. Check with local regulations before starting your swap.

Q5: What’s the difference between LS3 and L99?

The L99 is similar to the LS3 but includes Active Fuel Management (AFM) and VVT, typically found in automatic Camaro SS models.

Q6: Can I run an LS3 on pump gas?

Yes. The LS3 is designed to run on 91-octane pump gas, though premium fuel is preferred for performance builds.

Q7: How do I verify an LS3 engine before buying?

Check the engine casting number, perform a compression test, and verify the VIN if available. Always buy from a reputable seller.