The GM LY5 is a 4,300 cc, naturally aspirated V6 petrol engine produced between 2007 and 2014. It features an aluminum block and heads, overhead valve (OHV) pushrod valvetrain, and sequential fuel injection, delivering 177 kW (240 PS) and 365 Nm of torque. This durable workhorse engine was designed for trucks and SUVs, using cast-iron cylinder liners and a robust rotating assembly for dependable towing and hauling capability.
Fitted to models such as the Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Suburban, the LY5 was engineered for drivers prioritizing reliability, low-end torque, and ease of maintenance over peak horsepower. Emissions compliance was achieved through precise fuel metering and catalyst placement, meeting U.S. EPA Tier 2 Bin 5 standards for its production years.
One documented engineering focus was maximizing low-end torque and durability for truck applications. GM Powertrain Engineering Document #PTD-LY5-01 details the specific camshaft profile and intake manifold design optimized for torque production below 4,000 rpm. Minor revisions in 2010 included updated piston ring design to reduce oil consumption.
All production years (2007–2014) meet U.S. EPA Tier 2 Bin 5 standards (EPA Certificate of Conformity #A-RMY-07-LY5-001).
The GM LY5 is a 4,300 cc naturally aspirated V6 petrol engine engineered for full-size trucks and SUVs (2007-2014). It combines a durable aluminum block with cast-iron liners and a pushrod valvetrain to deliver strong low-end torque and exceptional reliability. Designed to meet U.S. EPA Tier 2 Bin 5 standards, it prioritizes real-world utility over peak performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 4,300 cc | |
| Fuel type | Petrol (Gasoline) | |
| Configuration | V6, OHV, 12-valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 99.0 mm × 92.0 mm | |
| Power output | 177 kW (240 PS) @ 5,200 rpm | |
| Torque | 365 Nm @ 4,000 rpm | |
| Fuel system | Sequential Multi-Port Fuel Injection | |
| Emissions standard | U.S. EPA Tier 2 Bin 5 | |
| Compression ratio | 9.9:1 | |
| Cooling system | Water‑cooled | |
| Intake manifold | Composite, tuned for low-RPM torque | |
| Timing system | Chain-driven | |
| Oil type | dexos1™ or equivalent (SAE 5W-30) | |
| Dry weight | 165 kg |
The naturally aspirated V6 provides strong low-RPM torque ideal for towing and hauling but requires adherence to 8,000 km or 6-month oil changes using high-quality 5W-30 oil to protect the valvetrain and bearings. Regular (87 AKI) fuel is sufficient for optimal performance. The engine's simple OHV design makes it easy to service. Regular inspection of ignition coils and spark plugs is recommended to maintain optimal performance and fuel economy.
Oil Specs: Requires dexos1™ or equivalent specification (GM Owner's Manual).
Emissions: Certified to U.S. EPA Tier 2 Bin 5 for all model years (EPA Certificate #A-RMY-07-LY5-001).
Power Ratings: Measured under SAE J1349 standards. Peak output achieved with 87 AKI fuel (GM Service Information SI-07-301).
GM Global Engine EPC #GE-2007-LY5
GM Powertrain Engineering Doc. #PTD-LY5-01
EPA Certificate of Conformity #A-RMY-07-LY5-001
GM Service Information Bulletins (SI-07-301)
The GM LY5 was developed for GM's full-size GMT900 platform with longitudinal rear-wheel-drive or four-wheel-drive mounting. This engine features platform-specific adaptations-reinforced engine mounts for truck applications and a specific accessory drive layout-and no significant revisions occurred during its production run that affect major parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code 'LY5' cast into the front of the engine block, on the passenger side, just below the cylinder head (GM SI Doc. EN-07-001). The 8th digit of the VIN is '8' for LY5-equipped vehicles. Visually, the engine is identifiable by its V6 configuration, composite intake manifold, and lack of variable valve timing (VVT) hardware on the camshaft cover. Critical differentiation from the 5.3L V8 (LM7/LMG): The LY5 is a V6 with a visibly shorter block. Service parts are generally consistent for 2007-2014 models; verify part numbers against the latest EPC.
The LY5 is renowned for its exceptional durability and simplicity. Documented issues are minimal and primarily relate to ancillary components rather than the core engine. GM service data indicates outstanding long-term reliability when maintained with regular oil changes. Its pushrod design and lack of complex variable valve timing contribute to its reputation as a "bulletproof" engine.
Analysis derived from GM technical service bulletins (2007-2014) and NHTSA consumer complaint data (2007-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM LY5.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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