6.2L EcoTec3 L86/L87 Engine - In-Depth Look at Design and Reliability (2024)

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6.2L EcoTec3 L86/L87 Engine - In-Depth Look at Design and Reliability (1)

GM/Chevy 6.2L EcoTec3 Info

The L86/L87 is an all-aluminum 6.2-liter naturally-aspirated and direct-injected gasoline V8 engine developed by GM for use in pickup trucks and SUVs (Chevrolet Silverado, GMC Sierra, Cadillac Escalade, GMC Yukon Denali, and more). This 6.2L V8 engine is part of the Gen5 small-bock engine family, also known as EcoTec3. The L86 version debuted in 2014 and replaced its predecessor out of Vortec truck engines, the L92 6.2-liter motor. The successor to the L86, the L87 version, came out in 2019. Both engines are basically identical, but the newest L87 variant uses Dynamic Fuel Management instead of the L86's Active Fuel Management. The 6.2L EcoTec3 was also available in Chevy sports cars and higher-performance Cadillac models (LT1, LT2, and supercharged LT4 and LT5). But in this article, let's take an in-depth look at the design of L86 and L87 truck engines, their common problems, and reliability.

GM 6.2 EcoTec3 Engine Overview

As was said, the GM 6.2 L86 and L87 are all aluminum engines. They use a 90-degree aluminum cylinder block with cast-in iron cylinder liners. By the way, the engine block is similar to the 5.3-liter EcoTec3 version. The 6.2-liter engine gets its displacement from the increased bore of 103.25 mm (4.065 in). The 92 mm (3.622 in) stroke is the same across all Gen5 small block engines. The rotating assembly features a forged-steel crankshaft, I-beam powder-metal connecting rods (6.098 in long), and cast aluminum domed pistons optimized for direct injection. Like the 5.3L V8 L83, this engine also had piston oil jets/squirters, a variable-displacement oil pump (wet sump), and nodular main bearing caps. All of these components work well for improving engine efficiency and extending long-term engine durability.

The 6.2L EcoTec3 engine features a pushrod OHV design and a single camshaft sitting inside the engine block. Aluminum cylinder heads come with two valves per cylinder (16 valves total). Pushrods activate intake and exhaust valves via low-friction roller-pivot rocker arms. Furthermore, the valvetrain includes hydraulic roller-lifters, and no valve clearance adjustment is required. Instead of the already conventional VVT system found in most modern engines with DOHC, the L86/L87 uses a dual-equal camshaft phasing system that adjusts timing at the same rate for both intake and exhaust valves. Compared to the 5.3L motor, the L86 6.2L version has larger valves. The intake valve diameter is 2.126 in. (54 mm); the exhaust valve diameter is 1.590 in. (40.4 mm). Pushrods are the same 7.85 inch-long with 0.342 in. (8.7 mm) outside diameter. The camshaft has the following specs: 200/207 duration (intake/exhaust), 0.551 in./0.524 in. valve lift for intake and exhaust, respectively.

In addition to a tank-located low-pressure fuel pump, the 6.2L L86/L87 engine has a high-pressure fuel pump mounted in the valley between cylinder heads. The camshaft drives the HP pump with an additional cam called a trilobe. This pump pressurizes fuel up to 15 MPa (150 bar) and sends it to direct injectors. And then, direct fuel injection technology precisely shoots fuel directly into the combustion chamber. Engineers also placed platinum-tipped spark plugs closer to the center of the combustion chamber to further improve the combustion process. The electronically controlled ignition system Quick Sync 58X also features individual coils near plugs and low-resistance spark plug wires. The truck-style intake manifold is made of composite material. It's fitted with a drive-by-wire electronic throttle body with a 4-bolt 87 mm throttle valve. The engine also got the newest E92 ECU, which manages all electronic systems and engine data.

Active Fuel Management Technology

The 6.2L L86 version features GM's Active Fuel Management (AFM) technology. The AFM is a cylinder deactivation technology that alternates between V-4 and V-8 modes depending on load conditions. It is an oil-operated system that deactivates the lifters on selected cylinders, closing the valves for those cylinders. The newer 6.2L L87 version switched to the latest Dynamic Fuel Management technology (DFM), which alternates between any of 17 different firing orders based on demand, calculated every 125 milliseconds. Both engines can run on gasoline or gasoline-ethanol blends of up to 85% ethanol (E85). Chevy/GMC trucks and SUVs with the 6.2L EcoTec3 motor are flex-fuel capable.

Engine Specs


GM Tonawanda engine plant in New York

Production years


Cylinder head material


Fuel type


Fuel system

Direct Injection



Number of cylinders


Valves per cylinder


Valvetrain layout


Bore, mm

103.25 mm (4.065 in)

Stroke, mm

92.0 mm (3.62 in)

Displacement, cc

6,162 cc (376 cu in)

Type of internal combustion engine

Four-stroke, naturally aspirated

Compression Ratio


Power, hp

420 hp (313 kW)/ 5,600

Torque, lb ft

460 lb-ft (624 Nm)/ 4,100

Engine weight


Firing order


Engine oil weight

SAE 0W-20

Engine oil capacity, liter

8.0 l (8.45 qt) - with oil filter

Oil change interval, mile

7,500 (12,000 km)/12 months


Chevrolet Silverado, Chevrolet Suburban, GMC Sierra, GMC Yukon XL, GMC Yukon Denali/Denali XL, Cadillac Escalade/Escalade ESV

GM 6.2L L86/L87 V8 EcoTec3 Engine Problems and Reliability

Like the entire EcoTec3 family, the 6.2-liter version was developed to offer a much more fuel-efficient and environmentally friendly V8 engine compared to the previous Vortec versions. Unfortunately, these two things are rarely combined with durability. The 6.2L EcoTec3 truck engine is not an exception.

GM 6.2L L86/L87 Common Problems

Here is the list of the most common Chevy/GMC 6.3L V8 EcoTec3 engine problems:

  • Carbon buildup on the intake valves
  • Lifters collapse and bent pushrods caused by the AFM system
  • Direct injection related problems (HP pump and direct injectors failure)
  • Unreliable intake manifold gaskets
  • Broken exhaust manifold bolts

While the last three common issues are not a big thing and a carbon build-up is the nature of almost every other direct-injected engine, stuck lifters and bent pushrods really hurt the reliability score of the 6.2L L86 motor (more information in the 5.3L EcoTec3 engine review). And this is doubly painful because this problem usually occurs on low-mileage, almost new trucks. Although the warranty may cover all fixes, the potential issue in the future undermines your confidence in your vehicle. We believe the newest 6.2L L87 version with the Dynamic Fuel Management system is the better choice and hope that it is less prone to lifter failures.

GM 6.2L L86/L87 Reliability Summary

Drawing the line, is the 6.2-liter EcoTec3 a good, reliable engine? Yes, it's not unreliable by any means. Of course, the engine is not perfect, and problems will occur, especially with age. But it also does not mean that the common problems above occur on every 6.2 EcoTec3 V8. To extend the engine life, use premium 93-octane gasoline, pour only the recommended oil, and keep your vehicle well maintained. With regular service intervals and proper maintenance, Chevy/GMC 6.2 L86/L87 engines can last over 250,000 miles.

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6.2L EcoTec3 L86/L87 Engine - In-Depth Look at Design and Reliability (2024)


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The most powerful LS in a production vehicle is in the upcoming 2023 Cadillac Escalade V, a 6.2-liter pushing 682 horsepower and 653 lb-ft of torque!

What is the engine code for the 6.2 LS? ›

Identification Chart
Displacement MarkingsBlock MaterialEngine/Series
6.0LAluminumLS2, L76, or L77
6.2LAluminumL92, L9H, or L94
6.2LAluminumLS3 or L99
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Is the LS engine a Ford design? ›

The fundamental architecture of the LS engine borrows more closely from the original small block chevy design. However the LS heads do share some similarity with Ford based heads that are run in many NASCAR engines.

Which is better, LT or LS? ›

The LT was developed by GM to replace the LS in their cars and help the company meet ever-tightening emissions and fuel economy standards. These engines are newer, more advanced, and much more fuel efficient than their LS brethren, but this all comes with a cost – they're more expensive.

Is Coyote better than LS? ›

With its dual overhead camshaft design and advanced engine management systems, the Coyote engine can offer better fuel economy compared to the LS engine. While both engines provide impressive power, those looking to prioritize fuel efficiency may find the Coyote engine to be a more suitable choice.

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What LS engine is best for boost? ›

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What engine code is L86? ›

The L86 V8 engine is produced by General Motors for use in pickup trucks and SUVs. It is part of GM's Gen V Small Bock engine design that's known in trucks as EcoTec3, replacing the Vortec line.

What engine is L87? ›

The L87 is a 6.2-liter, eight-cylinder engine from General Motors that's used in a range of pickup trucks and SUVs. Featuring an OverHead Valve (OHV), or “push-rod” design in a “V” configuration, the L87 is part of GM's Gen V Small Block engine architecture that's known in trucks and SUVs as EcoTec3.

What is a 6.2 L EcoTec3 V8 engine? ›

6.2-liter EcoTec3 V8

A stronger version of the 5.3-liter V8, the 6.2-liter engine puts out 420 horsepower and 460 pound-feet of torque. Make short work of tall tasks at the dig site and ensure you have total control of your drive. The lineup's strongest engine manages a maximum towing capacity of 13,400 pounds.

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The LS engine specs feature a six-bolt, deep-skirted block design that adds significant strength for leak-free sealing between the oil pan and the block. The main-cap design increases bottom-end strength so that the engine can handle more power. The factory windage tray improves windage for less drag on the crankshaft.

Why is 5.0 called Coyote? ›

Ford's Coyote engine is named after one of the most successful race cars in history. Ford's first four-valve V8-powered racecar - The Coyote - was made for driver AJ Foyt, who went on to win 25 out of 141 races with it!

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In social media and online communication, "LS" typically stands for "Long Story." It's often used when someone wants to share a lengthy or detailed story or explanation about something.

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