525 HP Chevrolet Performance LS3 Crate Engine

525 HP Chevrolet Performance LS3 Crate Engine

If you want factory-engineered high output with a GM warranty behind it, the 525 HP Chevrolet Performance LS3 is the answer. This is a genuine GM Performance Parts crate engine. It is not a rebuilt used unit, and it is not an aftermarket assembly. It comes new from Chevrolet Performance with a documented output specification and factory backing.

At 53LSEngine.com, we carry the Chevrolet Performance LS3 for buyers who want serious naturally aspirated power without the uncertainty of a custom build. You know exactly what you are getting because GM engineered and validated every component.

What Is the Chevrolet Performance LS3

The LS3 is a 6.2L naturally aspirated V8 from GM’s Gen 4 LS family. Chevrolet Performance sells it as a complete crate engine through the GM Performance Parts program. It shares the same core architecture that powered the 2008 through 2013 Corvette and the 2010 through 2015 Camaro SS.

In crate form, the LS3 produces 525 horsepower and 489 lb-ft of torque. That output comes straight from the factory without any supercharger, turbo, or aftermarket modification. Because it is naturally aspirated, you get that power with none of the supporting complexity a boosted setup demands.

For builders who want a known quantity rather than a build gamble, this engine removes the variables.

Why Choose a Factory Crate Engine

A factory GM crate engine differs from a built used engine in several meaningful ways.

Zero Mileage

This is a new engine. It has never run in a vehicle, never seen a donor history, and carries no accumulated wear. As a result, you start from a completely known baseline.

GM Engineering

Every component in this engine went through GM’s engineering and validation process at this specific output level. A custom build depends entirely on the quality of the builder and the parts they chose. The LS3 removes that variable.

Documented Output

GM rates this engine at 525 horsepower and 489 lb-ft of torque. That is a published factory figure, not a builder’s dyno estimate. Therefore, you can plan your drivetrain and gearing around a number you can trust.

Factory Warranty

The Chevrolet Performance LS3 comes with a GM Performance Parts limited warranty. A built aftermarket engine typically does not. That coverage carries real value if something goes wrong.

Rectangular Port Heads

The LS3 uses rectangular port cylinder heads, which flow considerably more air than cathedral port designs. Because of that airflow capacity, the engine makes 525 horsepower naturally aspirated without exotic components.

LS3 Specifications

GM occasionally updates crate engine configurations. Therefore, confirm the current part number and specification with us before ordering.

What Vehicles and Applications Suit the LS3

The LS3 uses the standard Gen 4 LS bellhousing bolt pattern. Consequently, it fits virtually any platform that supports an LS swap.

Factory Applications for Reference

• Chevrolet Corvette C6, 2008 through 2013
• Chevrolet Camaro SS, 2010 through 2015
• Pontiac G8 GXP, 2009

Common Crate Engine Applications

• Classic Camaro, Chevelle, Nova, and El Camino restomod builds
• C10 and square body truck performance builds
• Custom tube chassis and dedicated track cars
• Marine and off-road applications where a documented output figure matters
• Any LS-compatible chassis targeting 525 hp naturally aspirated

For truck and SUV replacement applications, see our Gen 4 Vortec 5.3 LS LH6 or Gen 5 EcoTec3 instead.

LS3 vs a Built 5.3 LS

Builders often weigh the LS3 against a built 5.3 LS. Here is how the two compare.

The LS3 costs more upfront. However, you get zero mileage, factory engineering, a published output figure, and warranty coverage. For a build where certainty matters more than initial cost, the LS3 is the stronger choice.

If budget drives the decision, our 5.3 LS Stage 3 Performance Build gives you a built option at a lower price point.

What Is Included

The Chevrolet Performance LS3 ships as a complete long block assembly. Contact us to confirm the exact component list on the current unit.

Typically Included

• Complete LS3 long block assembly
• Intake manifold
• Fuel rails and injectors
• Valve covers
• Oil pan
• Timing cover
• Harmonic balancer
• Water pump
• GM Performance Parts documentation

Not Included Unless Confirmed

• Engine controller and wiring harness
• Exhaust manifolds or headers
• Transmission
• Flywheel or flexplate
• Alternator, power steering pump, and air conditioning compressor
• Starter
• Radiator and cooling components

You need an engine controller and calibration matched to the LS3 before it will run. GM Performance offers a dedicated controller kit for this engine. Contact us to discuss whether that fits your application.

Supporting Systems You Will Need

The LS3 needs compatible supporting systems. Plan these before the engine arrives.

ECU and Wiring

The LS3 requires an engine controller matched to its fuel system and camshaft. GM Performance produces a controller kit built specifically for this crate engine, which simplifies non-factory installations considerably. Alternatively, standalone ECU solutions from Holley and other suppliers support the LS3 well.

Fuel System

The LS3 runs returnless port fuel injection. A quality electric fuel pump sized for the application works in virtually any chassis. Because there is no direct injection pump involved, the fuel system stays straightforward compared to a Gen 5 build.

Note that GM recommends 93 octane premium fuel for this engine. Plan your fuel supply accordingly.

Exhaust

The rectangular port cylinder heads require headers with rectangular port flanges. Cathedral port headers from earlier LS applications will not seal correctly. Therefore, confirm your header selection matches the LS3 head configuration before ordering.

Transmission

The LS3 uses the standard Gen 4 LS bellhousing pattern. It bolts to the T56, Tremec TR6060, Tremec TKO, TH350, TH400, 4L60E, 4L80E, and most other common GM manual and automatic transmissions. Confirm your flexplate or flywheel specification before ordering.

Cooling

Size your radiator for 525 horsepower rather than for a stock engine. A marginal cooling system will not keep up under sustained hard driving.

Documentation and Warranty

The LS3 ships as a new factory unit with GM Performance Parts documentation. Unlike a used engine, it needs no condition inspection because it has never run.

• New condition — Factory new, never installed, no donor history
• Part number verification — We confirm the current GM Performance part number before shipping
• Factory documentation — GM Performance Parts paperwork ships with the engine
• GM warranty — GM Performance Parts limited warranty applies from the date of purchase

Contact us at +1 (216) 230-5433 or Sales@53lsengine.com for current part number, specification, and warranty terms before ordering.

Pricing and Availability

The Chevrolet Performance LS3 carries a premium price that reflects its factory new condition, GM engineering, and included warranty. Contact us at +1 (216) 230-5433 or Sales@53lsengine.com for current pricing and availability.

Also review our refund and return policy before purchasing so you understand the full terms.

Shipping

Every engine ships on a certified freight pallet with all ports plugged and the assembly secured for transit. You receive a tracking number when it ships. Before signing the delivery receipt, inspect the pallet and packaging carefully. If you see visible shipping damage, note it with the carrier immediately.

For residential deliveries, confirm liftgate service with the freight carrier when scheduling.

Other Engine Options

Not sure the LS3 fits your build? Browse our other options instead.

• Gen 3 Vortec 5.3 LS LM7 — stock used engine for 1999 to 2007 replacements and mild swaps
• Gen 4 Vortec 5.3 LS LH6 — stock used engine for 2007 to 2013 applications with VVT
• Gen 5 EcoTec3 5.3 LS L83 and L86 — stock used engine for 2014 and newer applications
• 5.3 LS Stage 3 Performance Build — built 5.3 LS at a lower price point
• 510 to 560 HP Pro Built Complete Crate Engine — pro-built package with multiple block options
• Browse all used 5.3 LS engines
• Browse junkyard 5.3 LS engines
• Browse all build 5.3 LS engines

Frequently Asked Questions

Engine and Specification Questions

What is the Chevrolet Performance LS3 crate engine?
It is a new 6.2L naturally aspirated V8 sold through the GM Performance Parts program. It produces 525 horsepower and 489 lb-ft of torque at the factory specification. In addition, it comes with a GM Performance Parts limited warranty.

Is this a new or used engine?
This is factory new from Chevrolet Performance. It has never been installed in a vehicle and carries no donor history. It ships with GM Performance Parts documentation.

How does the LS3 differ from a 5.3 LS?
The LS3 is a 6.2L engine compared to the 5.3L displacement of the Vortec family. It uses rectangular port cylinder heads that flow more air than cathedral port heads. It also produces 525 hp from the factory rather than 270 to 355 hp depending on the 5.3 LS generation.

Installation Questions

Does the LS3 need a special ECU?
Yes. The LS3 requires an engine controller matched to its fuel system and camshaft. GM Performance makes a controller kit specifically for this crate engine. Standalone ECU solutions from Holley and others also support it well.

Do the rectangular port heads need special headers?
Yes. Cathedral port headers from earlier LS applications will not seal correctly against the LS3’s rectangular port heads. Therefore, confirm your header selection matches before ordering.

What transmission works with the LS3?
The LS3 uses the standard Gen 4 LS bellhousing pattern. It bolts to the T56, Tremec TR6060, TKO, TH350, TH400, 4L60E, 4L80E, and most other common GM transmissions.

What fuel does the LS3 require?
GM recommends 93 octane premium fuel for this engine. Plan your fuel supply accordingly, since running lower octane will cause the calibration to pull timing.

Ordering and Shipping Questions

Can I get the LS3 shipped to my location?
Yes. We ship to all 50 states via freight carrier on a secured pallet. Contact us with your delivery ZIP code and we then confirm the shipping cost before you order.

What warranty comes with the LS3?
The Chevrolet Performance LS3 comes with a GM Performance Parts limited warranty. Contact us for full terms before purchasing. Also review our refund and return policy.

Ready to Order Your LS3 Crate Engine

If you are ready for a factory-engineered 525 horsepower V8 with GM backing, contact us before you order. We then confirm current pricing, part number, specification, availability, and shipping cost for your location.

Call us: +1 (216) 230-5433
Email us: Sales@53lsengine.com

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