LS3 6.2L Engine Specifications

The LS3 combines a relatively compact small-block architecture with 6.2 liters of displacement and strong naturally aspirated performance.

Specification	LS3 6.2L
Engine Type	Gen IV Small-Block V8
Displacement	6.2L / 376 cu. in.
Configuration	V8
Bore	4.065 in.
Stroke	3.622 in.
Compression Ratio	10.7:1
Horsepower	430 hp @ 5,900 rpm
Torque	425 lb-ft @ 4,600 rpm
Maximum Recommended RPM	6,600 rpm
Block Material	Cast aluminum
Main Caps	6-bolt, cross-bolted
Cylinder Heads	Aluminum L92-style rectangular-port
Camshaft	Hydraulic roller
Crankshaft	Nodular iron
Connecting Rods	Powdered metal
Pistons	Hypereutectic aluminum
Rocker Ratio	1.7:1
Reluctor Wheel	58X
Balance	Internally balanced
Recommended Fuel	Premium pump fuel

These specifications are based on Chevrolet Performance’s published LS3 specifications. Different LS3-based crate-engine variants can produce substantially more power; for example, Chevrolet currently lists LS3-based configurations producing 480, 515 and 525 hp.

How Much Horsepower Does an LS3 6.2L Make?

The answer depends on which LS3 configuration you purchase.

The standard Chevrolet Performance LS3 is rated at 430 hp and 425 lb-ft of torque.

However, LS3-based performance crate engines can produce considerably more power without changing the basic 6.2L architecture.

For example, Chevrolet Performance lists:

• LS3: 430 hp / 425 lb-ft
• LS376/480: 495 hp / 473 lb-ft
• LS376/515: 525 hp / 486 lb-ft
• LS376/525: 525 hp / 486 lb-ft

These higher-output versions use different camshaft and configuration combinations, so buyers should compare the exact engine specification rather than assuming every LS3 produces the same power.

Why Buy an LS3 6.2L Engine?

1. Proven LS-Series Architecture

The LS platform is widely used in performance applications because of its compact design, strong aftermarket support and extensive availability of compatible components.

2. 6.2L Displacement

With 376 cubic inches of displacement, the LS3 provides strong naturally aspirated torque while remaining relatively compact compared with many larger-displacement V8 engines.

3. Aluminum Block

The LS3 uses a cast-aluminum block with six-bolt, cross-bolted main caps. This provides a strong foundation while helping keep engine weight manageable. Chevrolet’s catalog lists the complete LS3 crate engine at approximately 415 lb, while the long-block configuration is listed at approximately 384 lb.

4. Excellent Swap Potential

LS3 engines are frequently considered for custom builds, restomods, muscle cars, sports cars and other performance applications.

5. Strong Aftermarket Support

The LS3 has a large ecosystem of intake systems, exhaust components, engine-management systems, camshafts, cylinder-head upgrades, fuel systems and other performance components.

LS3 6.2L Engine Applications

An LS3 can be used in many different types of performance projects.

Popular applications include:

• Chevrolet Corvette projects
• Chevrolet Camaro builds
• Chevrolet SS projects
• Classic Chevrolet muscle cars
• Restomod vehicles
• Pro-touring builds
• Custom LS swaps
• Street-performance vehicles
• Track-oriented builds
• Custom hot rods
• Performance trucks
• Engine replacement projects

The exact suitability depends on the vehicle, transmission, engine-management system, oil-pan configuration, accessory drive and other installation requirements.

LS3 Crate Engine vs. Used LS3 Engine

When searching for an LS3 engine buyers should determine whether they need a new crate engine, used engine, pullout or long block.

LS3 Crate Engine

A crate engine is generally supplied as a complete or semi-complete engine package depending on the specific configuration.

Advantages can include:

• New or professionally assembled components
• Known specifications
• Easier planning for a performance build
• Manufacturer documentation
• Compatibility with specific accessory systems

Used LS3 Engine

A used LS3 may be sourced from a Corvette, Camaro, Chevrolet SS or another application.

Used engines can offer value, but buyers should verify:

• Engine mileage
• Compression condition
• Oil pressure
• Leak-down results
• VIN/application information
• Included accessories
• ECM availability
• Wiring harness
• Oil-pan configuration
• Sensor configuration
• Reluctor wheel
• Transmission compatibility

The contents of a used engine package can vary considerably between suppliers.

What Comes With an LS3 Engine?

Not every LS3 for sale includes the same components.

Depending on the listing, an LS3 may be offered as:

• Complete engine
• Long block
• Engine with intake manifold
• Engine with throttle body
• Engine with fuel rails and injectors
• Engine with starter
• Engine with alternator
• Engine with water pump
• Engine with accessory drive
• Engine with wiring harness
• Engine with ECM
• Complete drivetrain package

Always confirm exactly what is included before purchasing.

Chevrolet Performance also notes that some LS3 packages require the correct flexplate or clutch/flywheel combination depending on the transmission application.

LS3 Engine Transmission Compatibility

Choosing the correct transmission is an important part of an LS3 swap.

Possible transmission combinations can include:

Automatic Transmission

LS3 applications can be paired with automatic transmissions such as the 6L80-E, depending on the vehicle and installation requirements.

Manual Transmission

Manual options can include six-speed performance transmissions such as the Tremec-based systems used in suitable LS applications.

Chevrolet Performance has offered LS3 Connect & Cruise combinations with automatic and manual transmission packages, including 6L80-E and Super Magnum six-speed configurations.

Before purchasing an engine and transmission combination, verify bellhousing, flexplate/flywheel, clutch, transmission controller, driveshaft, crossmember and ECU requirements.

What Should You Check Before Buying an LS3 Engine?

If you are planning to buy an LS3 engine online in the USA, check the following information before placing an order:

Engine Identification

Confirm the exact LS3 configuration and application.

Engine Condition

For a used engine, ask for information about mileage, compression testing, leak-down testing and running condition when available.

Included Components

Confirm whether the engine includes the intake, injectors, throttle body, alternator, starter, water pump, wiring harness and ECM.

Oil Pan Configuration

The oil pan can affect engine-swap compatibility. Confirm that the configuration works with your vehicle’s crossmember and chassis.

Reluctor Wheel

The LS3 uses a 58X reluctor configuration in Chevrolet Performance specifications, but engine-management compatibility should always be verified.

Transmission

Make sure the engine configuration matches your automatic or manual transmission requirements.

ECU and Wiring

Determine whether the engine is supplied with the correct ECM, wiring harness and control system or whether these must be purchased separately.

LS3 6.2L Engine for Performance Builds

One of the biggest advantages of the LS3 platform is its ability to serve as the foundation for different levels of performance.

A standard LS3 can be used for a reliable street-oriented build, while upgraded camshafts, cylinder heads, intake systems, exhaust systems, tuning and other modifications can increase output.

Chevrolet Performance itself offers several LS3-based crate-engine configurations with power ratings above the standard 430-hp LS3.

For serious performance projects, the correct combination of engine internals, fuel system, cooling system, ECU calibration and drivetrain components is essential.

Buying an LS3 6.2L Engine from Forged & Stocked Engines

If you are looking for an LS3 6.2L engine for sale in the USA, Forged & Stocked Engines is focused on supplying engines, transmissions and performance powertrain products to customers and automotive businesses.

Our current website includes dedicated engine, gearbox and supercharged product categories.

Before ordering an LS3 engine, we recommend confirming:

• Exact engine specification
• New, used or rebuilt condition
• Horsepower rating
• Mileage, if applicable
• Included accessories
• Transmission compatibility
• ECU and wiring requirements
• Oil-pan configuration
• Shipping requirements
• Warranty terms
• Availability

For current LS3 availability, specifications and pricing, contact Forged & Stocked Engines directly.

LS3 6.2L Engine Shipping in the USA

Performance engines are heavy and require appropriate packaging and freight handling.

Depending on the engine configuration and destination, an LS3 can be prepared for secure freight shipment using appropriate protective packaging.

For larger engine shipments, buyers should provide the correct delivery information, including:

• Full delivery address
• ZIP code
• Commercial or residential destination
• Loading dock availability
• Liftgate requirements
• Contact telephone number

Shipping arrangements should be confirmed before payment so the correct freight method can be selected.

Frequently Asked Questions About the LS3 6.2L Engine

Is the LS3 a 6.2L engine?

Yes. The LS3 has a displacement of 6.2 liters, equivalent to 376 cubic inches.

How much horsepower does a stock LS3 make?

The standard Chevrolet Performance LS3 is rated at 430 horsepower at 5,900 rpm and 425 lb-ft of torque at 4,600 rpm.

Is the LS3 a Gen 4 engine?

Yes. The LS3 is a Gen IV small-block V8.

What is the LS3 compression ratio?

The standard LS3 specification uses a 10.7:1 compression ratio.

What is the LS3 bore and stroke?

The LS3 has a 4.065-inch bore and 3.622-inch stroke.

Is the LS3 good for an engine swap?

Yes. The LS3 is widely used as a performance-swap platform, but the exact installation requirements depend on the vehicle. Oil-pan clearance, engine mounts, wiring, ECU, cooling, exhaust and transmission compatibility should all be checked.

Can I buy an LS3 6.2L engine online?

Yes. LS3 engines are available through performance-engine suppliers and automotive parts businesses. When buying online, verify the exact engine configuration, condition, included components, warranty and shipping arrangements.

Order an LS3 6.2L Engine for Sale USA

Ready to find the right LS3 6.2L engine for your project?

Forged & Stocked Engines supplies performance engines and powertrain solutions for builders, workshops, tuners and automotive businesses.

Contact us to confirm LS3 6.2L engine availability, specifications, condition, included components, pricing and shipping options for your U.S. project.

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