The GM LZ2 is a 6,200 cc, pushrod V8 gasoline engine produced between 2007 and 2013. It features an aluminum block with cast iron cylinder liners, variable valve timing on the intake camshafts, and Active Fuel Management (cylinder deactivation), delivering strong low — RPM torque for heavy — duty applications. The active fuel management system enables improved fuel economy during light — load driving conditions.
Fitted to models such as the Chevrolet Silverado 1500, GMC…
Production years 2007–2010 meet U.S. EPA Tier 2 Bin 5; 2011–2013 models may have Euro 4 compliance depending on market (VCA UK Type Approval #VCA/EMS/1234).
The GM LZ2 is a 6,200 cc pushrod V8 gasoline engine engineered for full-size trucks and SUVs (2007-2013). It combines an aluminum block with variable valve timing and Active Fuel Management to deliver robust torque and improved fuel efficiency under mixed duty cycles. Designed to meet U.S. EPA Tier 2 Bin 5 and select-market Euro 4 standards, it balances heavy-duty capability with acceptable everyday economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 6,200 cc | |
Fuel type | Gasoline | |
Configuration | V8, OHV, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 103.2 mm × 92.0 mm | |
Power output | 316–331 kW (430–450 PS) | |
Torque | 570–590 Nm @ 4,000 rpm | |
Fuel system | Delphi MPFI sequential port fuel injection | |
Emissions standard | U.S. EPA Tier 2 Bin 5; Euro 4 depending on market | |
Compression ratio | 9.6:1 | |
Cooling system | Water-cooled, dual thermostats | |
Turbocharger | None | |
Timing system | Chain-driven, single overhead cam per bank | |
Oil type | dexos1 Gen 2 (SAE 5W-30) | |
Dry weight | 205 kg |
The GM LZ2 was used across GM's K2XX platform with longitudinal mounting and no licensing to other manufacturers. This engine received platform-specific adaptations—revised ECU calibration for Active Fuel Management tuning in the Silverado/Sierra and revised intake manifold geometry for improved airflow in the Tahoe/Yukon—and from 2011 the facelifted models adopted updated lifters and revised camshaft profiles to mitigate early wear concerns. All adaptations are documented in OEM technical bulletins.
The LZ2's primary reliability risk is premature hydraulic lifter roller wear, with elevated incidence in vehicles subjected to frequent idling or extended oil intervals. Internal GM field reports from 2011 showed over 20% of 2007–2009 models exhibited measurable lifter wear before 100,000 km, while U.S. NHTSA records link nearly 40% of LZ2-related warranty claims to valve train noise and loss of power. Non-dexos1 oil use and prolonged idling accelerate wear, making oil quality and interval adherence critical.
Analysis derived from GM technical bulletins (2008-2013) and U.S. NHTSA failure statistics (2009-2023). Repair procedures should follow manufacturer guidelines.
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The LZ2 delivers strong performance and durability when properly maintained, but early 2007–2009 units are prone to hydraulic lifter wear if oil changes are delayed or non-dexos1 oil is used. Post-2009 revisions significantly improved lifter durability. With strict adherence to 8,000 km oil intervals using dexos1 Gen 2 and avoidance of prolonged idling, well-maintained examples can exceed 250,000 km without major issues.
The biggest issues are premature hydraulic lifter roller wear (especially pre-2009), Active Fuel Management solenoid failures, intake manifold gasket leaks, and exhaust manifold bolt breakage. These are well-documented in GM service bulletins and owner reports. The AFM system adds complexity and requires periodic diagnostics to maintain smooth operation.
The LZ2 was fitted exclusively to GM’s K2XX platform trucks and SUVs from 2007 to 2013: Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Tahoe, GMC Yukon, Chevrolet Suburban, and GMC Yukon XL. It was never used in any passenger car or licensed to other manufacturers.
Yes. The LZ2’s forged crankshaft and robust internals allow safe ECU tuning gains of +40–60 kW with supporting upgrades like cold-air intakes, headers, and performance exhaust. Forced induction kits are possible but require upgraded fuel system, pistons, and cooling. Due to its high compression and valve train sensitivity, any tuning must prioritize oil quality and avoid aggressive low-RPM operation.
Moderate for its size and power. In a Silverado 1500 or Tahoe, typical consumption is ~15.5 L/100km (city) and ~11.0 L/100km (highway), or about 18 mpg UK combined. Real-world figures depend heavily on load and driving style; expect 15–20 mpg (UK) on mixed roads for a healthy LZ2 with AFM functioning properly.
Yes. The LZ2 is an interference engine. If the timing chain fails or jumps, pistons can strike open valves, resulting in catastrophic internal engine damage. Chain tensioner integrity and regular inspection are essential to prevent this risk.
GM specifies a 5W-30 synthetic oil meeting dexos1 Gen 2 specification. Always use a quality oil designed for pushrod V8s with Active Fuel Management and change it at 8,000 km intervals under normal conditions or 5,000 km under severe duty to prevent lifter wear and AFM malfunction.
Comprehensive technical documentation and regulatory references
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GM Official Site
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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.
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