LS3 Engine: Specifications and FAQs

The LS3 engine is one of the most iconic and high-performance powertrains in the world of American muscle cars. Developed by General Motors (GM) as part of the LS family of engines, the LS3 is an evolution of the previous LS2 engine. It is known for its remarkable horsepower, torque, and overall reliability, making it a popular choice for enthusiasts, racers, and those looking to upgrade their vehicles.

This article will explore the specifications, features, and frequently asked questions (FAQs) about the LS3 engine.

LS3 Engine Specifications

1. Engine Type

Type: V8, naturally aspirated
Displacement: 6.2 liters (376 cubic inches)
Configuration: OHV (Overhead Valve) with push rods
Bore x Stroke: 4.065 inches x 3.622 inches (103.25mm x 92mm)
Compression Ratio: 10.7:1

2. Performance

Horsepower: 430 hp (320 kW) at 5,900 RPM
Torque: 424 lb-ft (574 Nm) at 4,600 RPM
Redline: 6,600 RPM
Max RPM: 7,000 RPM
Fuel System: Multi-port fuel injection (MPI)
Ignition: Coil near plug (CNP) for each cylinder

3. Engine Block and Components

Block Material: Cast aluminum with an iron liner
Cylinder Head Material: Aluminum
Crankshaft: Forged steel
Pistons: Hypereutectic aluminum alloy
Connecting Rods: Powdered metal
Valves: 16 valves (2 per cylinder), with intake and exhaust valves controlled by a roller camshaft
Camshaft: Hydraulic roller camshaft with advanced timing

4. Cooling and Lubrication

Cooling: Water-cooled with an aluminum radiator
Lubrication: Wet sump with a high-flow oil pump

5. Fuel Efficiency and Emissions

Fuel Type: Premium unleaded gasoline
Fuel Economy: Approx. 15–16 mpg (city), 25 mpg (highway) depending on the vehicle
Emissions Standard: Meets U.S. EPA Tier 2 Bin 5 and CARB LEV II emissions standards

6. Applications

Corvette C6 (2008–2013)
Chevrolet Camaro SS (2010–2015)
Pontiac G8 GXP
Chevrolet SS Sedan
Various Aftermarket and Swap Applications

Key Features and Highlights

1. High-Performance Roots

The LS3 engine belongs to the LS family, which has a reputation for delivering performance in spades. The engine’s large displacement and modern technologies give it exceptional power, reliability, and tuning potential.

2. Efficient Fuel Injection

Thanks to its multi-port fuel injection (MPI) system, the LS3 delivers smooth power delivery, excellent throttle response, and enhanced fuel efficiency compared to earlier generations.

3. Durability and Strength

The LS3 engine is known for its robust build. The engine block is made of cast aluminum with iron liners, ensuring a durable structure that can withstand high levels of stress. Additionally, the forged steel crankshaft and hypereutectic aluminum alloy pistons contribute to the engine’s longevity and high-revving capabilities.

4. High Revving Engine

The LS3 is designed to perform well at higher RPMs, thanks to its lightweight components and advanced engineering. The high compression ratio of 10.7:1 helps the engine achieve strong power output at higher engine speeds.

5. Tuning and Aftermarket Potential

The LS3 engine is a favorite among tuners and engine swap enthusiasts. With a solid aftermarket support system, upgrading the LS3 with forced induction, camshaft swaps, and performance parts is common. Many owners go on to push the engine well beyond its factory ratings, achieving even more impressive performance numbers.

Frequently Asked Questions (FAQs)

1. What is the LS3 engine?

The LS3 is a 6.2-liter V8 engine developed by General Motors. It’s part of the LS family, offering high horsepower and torque output, and is used in high-performance vehicles such as the Chevrolet Corvette C6 and the Camaro SS.

2. What vehicles did the LS3 come in?

The LS3 engine was primarily used in the 2008–2013 Chevrolet Corvette C6, 2010–2015 Chevrolet Camaro SS, and the Pontiac G8 GXP. It was also available in some Chevrolet SS Sedans and as part of various crate engine packages for racing and custom builds.

3. How much horsepower does the LS3 engine produce?

The LS3 engine produces 430 horsepower at 5,900 RPM and 424 lb-ft of torque at 4,600 RPM. These numbers make it a strong performer in factory applications, with potential for even more power with aftermarket upgrades.

4. What is the displacement of the LS3 engine?

The LS3 has a displacement of 6.2 liters, or 376 cubic inches, which provides a large base for high horsepower and torque production.

5. Can you turbocharge or supercharge the LS3 engine?

Yes, the LS3 is a popular engine for forced induction upgrades such as turbocharging or supercharging. These modifications can dramatically increase power output, with some setups achieving over 1,000 horsepower.

6. What is the difference between the LS3 and the LS2?

The LS3 is an updated and more powerful version of the LS2. The LS3 has a larger displacement (6.2L vs. 5.7L), a higher compression ratio, and more advanced components, resulting in improved performance and efficiency.

7. What are common upgrades for the LS3 engine?

Popular upgrades for the LS3 include a performance camshaft, cold air intake, headers, high-flow fuel injectors, and forced induction (superchargers or turbochargers). Additionally, many owners opt for ECU tuning to optimize performance.

8. What is the lifespan of an LS3 engine?

With proper maintenance, an LS3 engine can last well over 100,000 miles (160,934 kilometers) before requiring major repairs. Regular oil changes, cooling system maintenance, and timely replacement of components like spark plugs and belts will ensure its longevity.

9. Is the LS3 a good engine for swaps?

Yes, the LS3 is frequently used in engine swaps. Its compact size, high reliability, and availability make it a go-to choice for enthusiasts looking to swap a V8 engine into a wide variety of vehicles, from muscle cars to trucks.

10. What’s the cost of an LS3 crate engine?

The price of an LS3 crate engine can vary depending on the supplier and whether it includes accessories such as intake, alternator, or wiring. On average, a complete LS3 crate engine costs between $6,000 and $8,000.

Conclusion

The LS3 engine has earned its place in automotive history thanks to its impressive performance, durability, and tuning potential. Whether you’re driving a factory-equipped Chevrolet Camaro SS or planning an engine swap for your custom build, the LS3 is a powerhouse that can deliver exceptional horsepower and torque. Its robust construction and the ease with which it can be modified ensure that it remains one of the most popular choices for performance enthusiasts today.

ls3 engine