The GM LY6 is a 6,000 cc, 90° V8 naturally aspirated petrol engine produced between 2007 and 2014. It features a pushrod (OHV) design with variable valve timing (VVT) and sequential fuel injection, delivering 298 kW (400 PS) and 530 Nm of torque. Its cast — iron block and aluminum heads provide a robust foundation for commercial and performance applications.
Fitted to full — size trucks and SUVs such as the Chevrolet Silverado and GMC Yukon, the LY6 was engineered for maximum t…
All LY6 engines meet US EPA Tier 2 Bin 5 emissions standards (EPA Certificate of Conformity #A-69-07). No Euro standard compliance applies as it was not offered in European markets.
The GM LY6 is a 6,000 cc 90° V8 naturally aspirated petrol engine engineered for heavy-duty trucks and SUVs (2007-2014). It combines a robust pushrod valvetrain with variable valve timing to deliver strong, low-end torque for towing and hauling. Designed to meet US EPA Tier 2 standards, it prioritizes durability and power for demanding applications.
| Parameter | Value | Source |
|---|---|---|
Displacement | 6,000 cc | |
Fuel type | Petrol | |
Configuration | 90° V8, OHV, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 101.6 mm × 92.0 mm | |
Power output | 298 kW (400 PS) @ 5,000 rpm | |
Torque | 530 Nm @ 4,000 rpm | |
Fuel system | Sequential multi-port fuel injection (SFI) | |
Emissions standard | US EPA Tier 2 Bin 5 | |
Compression ratio | 9.6:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 209 kg |
The GM LY6 was used across GM's GMT900 platform with longitudinal mounting. This engine received no major platform-specific adaptations within its production run. All applications are documented in OEM service manuals.
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The LY6's primary reliability risk is VVT solenoid failure, with a documented incidence in early production vehicles. GM's own service data and bulletin 07187B confirm this was a design-related issue, not isolated to specific usage. Vehicles with infrequent oil changes or using non-Dexos oil are at greater risk, making adherence to the maintenance schedule critical.
Analysis derived from GM technical bulletins (2007-2014) and NHTSA investigation data. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The LY6 is a powerful and durable engine, but its long-term reliability depends on addressing the known VVT solenoid issue. Once the updated solenoid is installed, the engine's core is very robust. Strict adherence to the oil change schedule using Dexos1 oil is paramount for longevity, as is addressing any AFM lifter issues promptly.
The most common problem is VVT solenoid failure. Other frequent issues include Active Fuel Management (AFM) lifter failure, intake manifold gasket leaks, and water pump failure. These are extensively documented in GM service bulletins and owner reports.
The LY6 was used in GM's full-size truck and SUV lineup from 2007 to 2014. This includes the Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Suburban 1500, GMC Yukon XL 1500, and Cadillac Escalade. It was not used in smaller vehicles or vans.
Yes, the LY6 responds well to tuning. An ECU remap (‘tune’) can yield modest power gains (+20-40 HP). More significant gains require hardware modifications like a performance camshaft, headers, and a high-flow intake. Disabling Active Fuel Management (AFM) via a tune is also a common modification to improve reliability.
Fuel economy is typical for a 6.0L V8 in a large truck or SUV. Expect around 14-16 mpg (US) in combined city/highway driving. Highway cruising can yield 19-21 mpg (US), while city driving will be lower, around 12-14 mpg (US).
No. The LY6 is a non-interference engine. This means that if the timing chain were to fail, the pistons and valves would not collide, preventing catastrophic internal engine damage. This is a safety feature of its pushrod design.
GM mandates the use of Dexos1 specification oil, typically in a 5W-30 viscosity. This oil is specifically formulated for GM's V8 engines. Using the correct oil and changing it at the recommended intervals (every 7,500 miles) is critical for engine health, especially for the VVT system.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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