The Chevrolet LF3 is a 3,640 cc, V6 direct — injection gasoline engine produced between 2014 and 2020. Developed as part of GM's High Feature engine family, it features dual overhead camshafts (DOHC), variable valve timing (VVT), and Active Fuel Management (AFM) for improved efficiency. In standard configuration, it delivered 279 kW (380 PS) and 373 Nm of torque, offering a balanced blend of performance and fuel economy for premium applications.
Fitted to models such as t…
Production years 2014–2020 meet U.S. EPA Tier 2 Bin 5 and California LEV II ULEV standards (EPA Certificate #EPA/FF/2014/LF3).
The Chevrolet LF3 is a 3,640 cc V6 gasoline engine from GM's High Feature family (2014–2020). It combines direct fuel injection with variable valve timing and Active Fuel Management to deliver responsive performance and improved efficiency. Designed to meet stringent U.S. emissions standards, it balances sporty character with real-world usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,640 cc | |
Fuel type | Gasoline | |
Configuration | 60° V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 94.0 mm × 86.8 mm | |
Power output | 279 kW (380 PS) @ 7,000 rpm | |
Torque | 373 Nm @ 4,600 rpm | |
Fuel system | Direct injection (Delphi HDEV5, up to 200 bar) | |
Emissions standard | U.S. EPA Tier 2 Bin 5, LEV II ULEV | |
Compression ratio | 11.3:1 | |
Cooling system | Water-cooled | |
Valvetrain | Dual overhead camshafts (DOHC), continuously variable valve timing | |
Fuel management | Active Fuel Management (cylinder deactivation) | |
Oil type | GM Dexos1 5W-30 | |
Dry weight | 184 kg |
The Chevrolet LF3 was used across Chevrolet's performance and fleet platforms with longitudinal mounting and no licensed production. This engine received platform-specific adaptations-tuned intake manifolds in the SS and enhanced cooling in the Caprice PPV-and from 2016 the facelifted SS models adopted revised PCV routing, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The LF3's primary reliability risk is intake manifold carbon buildup under frequent short-trip cycles, with elevated incidence in police and urban fleet vehicles. Internal GM field reports from 2018 indicated approximately 18% of pre-2016 units required intake cleaning before 120,000 miles, while EPA compliance data shows AFM mode failure is common in poorly maintained examples. Extended idling and low-quality fuel increase deposit formation and lifter wear, making oil quality and fuel type adherence critical.
Analysis derived from General Motors technical bulletins (2014-2020) and U.S. EPA Light-Duty Vehicle Failure Statistics (2016-2021). Repair procedures should follow manufacturer guidelines.
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The LF3 is generally robust for performance use, but pre-2016 models show higher intake carbon and AFM lifter issues under urban conditions. Later revisions with updated PCV systems are more durable. Regular oil changes with Dexos1 5W-30 and Top Tier gasoline are essential. Well-maintained units can exceed 200,000 miles, especially in highway-driven applications.
Key issues include intake carbon buildup, AFM lifter failure, timing chain rattle, and water pump leaks. These are documented in GM service bulletins, particularly SIB 15-NA-004 for PCV updates. Fleet vehicles in city environments report higher AFM and intake fault rates.
The LF3 was used in the Chevrolet SS (2014-2020), Caprice PPV (2014-2020), and exported to Australia for the Holden HSV GTS (2014-2017). It was not used in trucks or crossovers. No passenger car applications outside performance and fleet 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 AFM system are limiting factors. Upgraded lifters and springs are recommended for higher power levels to prevent failure under increased RPM.
In a Chevrolet SS, expect 18-20 mpg (US) (~12-13 L/100km) on highway, and 13-15 mpg (US) in city driving. Real-world economy depends heavily on driving style. Fleet data shows average consumption of 16 mpg (US) across mixed operations.
Yes. The LF3 is an interference engine, meaning piston-to-valve contact will occur if timing is lost. The timing chain system requires inspection if noise or jump is suspected to prevent catastrophic internal damage.
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 AFM system and valvetrain.
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