The GM LS2 is a 5,967 cc, 90° V8 naturally aspirated petrol engine produced between 2005 and 2007. It features an aluminum block and heads, sequential fuel injection, and a high-flow intake manifold, delivering a broad, flat torque curve ideal for spirited driving. Its Gen IV architecture incorporates improved cylinder head porting for enhanced volumetric efficiency.
Fitted to performance icons like the Chevrolet Corvette C6, SSR pickup, and Pontiac GTO, the LS2 was engineered for responsive power delivery and high-revving character. Emissions compliance was achieved through precise electronic throttle control and catalytic converters, meeting U.S. EPA Tier 2 Bin 5 standards.
One documented concern is potential lifter tick or failure under aggressive driving, noted in GM Service Bulletin 06-06-01-021A. This is often attributed to oil starvation at high RPM or insufficient lifter bore clearance in early production. GM addressed this in subsequent LS3/LS7 engines with revised lifter designs and oiling passages.
Production years 2005–2007 meet U.S. EPA Tier 2 Bin 5 standards; not certified for Euro markets (VCA UK Type Approval not applicable).
The GM LS2 is a 5,967 cc 90° V8 naturally aspirated petrol engine engineered for sports cars and performance sedans (2005-2007). It combines an aluminum block with high-flow cylinder heads and a 90mm-bore architecture to deliver strong, linear power. Designed to meet U.S. EPA Tier 2 Bin 5 standards, it prioritizes driver engagement and high-RPM performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 5,967 cc | |
| Fuel type | Petrol | |
| Configuration | 90° V8, OHV, 16-valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 101.6 mm × 92.0 mm | |
| Power output | 298–336 kW (400–450 PS) | |
| Torque | 542–570 Nm @ 4,400 rpm | |
| Fuel system | Sequential Multi-Port Fuel Injection (SFI) | |
| Emissions standard | U.S. EPA Tier 2 Bin 5 | |
| Compression ratio | 10.9:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Chain-driven | |
| Oil type | GM Dexos1 5W-30 | |
| Dry weight | 185 kg |
The high-compression, large-bore design provides exhilarating acceleration but requires premium unleaded fuel (minimum 91 octane) to prevent detonation. GM Dexos1 5W-30 oil is critical for protecting flat-tappet lifters and maintaining hydraulic lifter function, especially during high-RPM operation. Aggressive driving can exacerbate lifter wear; regular oil analysis is recommended for track use. The aluminum block is robust, but head gasket integrity relies on proper torque sequence during servicing. Intake manifold gaskets are a known wear item; replacement with updated OEM parts is advised.
Oil Specs: Requires GM Dexos1 5W-30 specification (GM SIB 06-06-01-021A). API SN/ILSAC GF-5 is the minimum acceptable standard.
Emissions: Meets U.S. EPA Tier 2 Bin 5 standards only (EPA Cert. LS2-V8-05). Not homologated for EU or UK markets.
Power Ratings: Measured under SAE J1349 standards. 450 PS output (Corvette) requires 91+ octane fuel (GM TIS Doc. LS2-003).
GM Technical Information System (TIS): Docs LS2-001, LS2-003, SIB 06-06-01-021A
U.S. Environmental Protection Agency: Engine Family Certification LS2-V8-05
SAE International: J1349 Engine Power Certification Standards
The GM LS2 was used across GM's Y-Body and Kappa platforms with longitudinal rear-wheel-drive mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Corvette and a unique air intake for the GTO-and was succeeded by the higher-displacement LS3 in 2008, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a machined pad at the front of the engine block, passenger side, near the cylinder head (GM TIS Doc. LS2-001). The 8th VIN digit is 'U' for LS2 engines. Visually, the LS2 can be identified by its black composite intake manifold with a large, centrally located throttle body and prominent 'LS2' casting on the front of the block. Critical differentiation from LS1/LS6: LS2 uses a 90mm bore (vs. 99mm for LS7, 96mm for LS1) and has a rectangular oil pan rail profile. ECM calibrations are specific to application (e.g., Corvette vs. GTO) and are not directly interchangeable without reprogramming.
The LS2's primary reliability risk is hydraulic lifter failure, with elevated incidence in high-RPM or track-driven applications. GM internal data indicated a correlation between oil viscosity breakdown and lifter noise in modified or heavily used engines, while enthusiast forums frequently cite this as a maintenance-related issue. Sustained high engine speeds and insufficient oil changes make using the correct Dexos1 specification critical.
Analysis derived from GM technical bulletins (2005-2007) and aggregated enthusiast diagnostic data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM LS2.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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