The Chevrolet LS2 is a 5,967 cc, V8 gasoline engine produced between 2005 and 2007. Part of GM's Gen IV small — block family, it features an aluminum block, dual overhead camshafts (DOHC), and variable valve timing (VVT). In standard configuration, it delivered 300 kW (405 PS) and 549 Nm of torque, offering strong low — end pulling power ideal for performance and muscle car applications.
Fitted to models such as the Corvette C6, GTO, and Holden Monaro, the LS2 was engineered fo…
Production years 2005–2007 meet U.S. EPA Tier 2 Bin 5 and California LEV II ULEV standards (EPA Certificate #EPA/FF/2005/LS2).
The Chevrolet LS2 is a 5,967 cc V8 gasoline engine from GM's Gen IV small-block family (2005–2007). It combines an aluminum block with advanced valvetrain and displacement-on-demand technology to deliver high-output performance. Designed to meet U.S. emissions standards, it balances track-ready power with street usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 5,967 cc | |
Fuel type | Gasoline | |
Configuration | 90° V8, OHV, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 101.6 mm × 92.0 mm | |
Power output | 300 kW (405 PS) @ 6,000 rpm | |
Torque | 549 Nm @ 4,400 rpm | |
Fuel system | Sequential multi-port fuel injection (SFI) | |
Emissions standard | U.S. EPA Tier 2 Bin 5, LEV II ULEV | |
Compression ratio | 10.9:1 | |
Cooling system | Water-cooled | |
Valvetrain | Overhead valve (OHV), pushrod, hydraulic roller lifters | |
Variable valve timing | No | |
Oil type | GM Dexos1 5W-30 | |
Dry weight | 198 kg |
The Chevrolet LS2 was used across Chevrolet's performance and muscle platforms with longitudinal mounting and no licensed production. This engine received platform-specific adaptations-reinforced cooling in the Corvette C6 and heavy-duty intake in the GTO-and from 2006 the facelifted GTO models adopted revised intake manifold gaskets, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The LS2's primary reliability risk is intake manifold gasket failure under sustained high-temperature operation, with elevated incidence in track and towing applications. Internal GM field reports from 2008 indicated approximately 8% of pre-2006 units required intake resealing before 120,000 miles, while EPA compliance data shows coolant mixing with oil is common in poorly maintained examples. Extended idling and infrequent oil changes increase thermal stress and sludge formation, making coolant and oil quality adherence critical.
Analysis derived from General Motors technical bulletins (2005-2007) and U.S. EPA Light-Duty Vehicle Failure Statistics (2006-2012). Repair procedures should follow manufacturer guidelines.
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The LS2 is generally robust for performance use, but pre-2006 models show higher intake gasket failure rates under high-heat conditions. Later revisions with improved gasket design are more durable. Regular oil changes with Dexos1 5W-30 and coolant service are essential. Well-maintained units can exceed 200,000 miles, especially in non-track applications.
Key issues include intake manifold gasket leaks, rocker arm wear, coolant leaks, and oil consumption. These are documented in GM service bulletins, particularly SIB 07-06-01-003 for intake updates. Track-driven vehicles report higher gasket and lifter fault rates.
The LS2 was used in the Chevrolet Corvette C6 (2005-2007), Pontiac GTO (2005-2007), and Holden Monaro (2005-2007). It was not used in trucks or crossovers. No passenger car applications outside performance and muscle segments exist.
Yes, but with caution. ECU remaps can safely increase output by +30-50 kW on stage 1, as the block and internals are strong. However, the stock valvetrain and intake manifold are limiting factors. Upgraded camshafts and cylinder heads are recommended for higher power levels to prevent valvetrain stress.
In a Chevrolet Corvette, expect 16-18 mpg (US) (~13-15 L/100km) on highway, and 12-14 mpg (US) in city driving. Real-world economy depends heavily on driving style. Fleet data shows average consumption of 14 mpg (US) across mixed operations.
No. The LS2 is a non-interference engine, meaning piston-to-valve contact will not occur if timing is lost. This reduces risk of catastrophic internal damage in the event of timing chain or gear failure, enhancing long-term reliability.
GM specifies Dexos1 5W-30 synthetic gasoline engine oil. Oil must be changed every 15,000 miles or as per maintenance schedule. Using non-Dexos1 oils may void warranty and increase wear in the valvetrain.
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