GM 5.3 vs 6.2

Chevy 5.3 vs 6.2

Jake Mayock

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Jake is a founder of 8020 Media and TuningPro. He has over a decade of experience in the automotive industry including parts sales, writing, DIY modifications & repairs, and more. Jake is currently converting his N54 to a single turbo and building a Miata track car. He’s an experienced, hands-on automotive enthusiast who delivers in-depth, well-researched content.

The Chevy L84 5.3L and L87 6.2L are both excellent small-block engines. Despite coming from the same Gen V small block engine family, both engines have a unique set of features that must be carefully evaluated before deciding on one. General Motors produced the 5.3L and 6.2L engines for a variety of applications in pickup trucks and SUVs from 2019 until the present day. Their track record of performance has certainly earned them respect in the industry.

This article will provide a detailed comparison of Chevy 5.3 and 6.2 engine specifications, towing capacity, reliability, engine applications, and common problems. Continue reading to learn more!

GM 5.3 vs 6.2

Chevy 5.3 vs 6.2 Specifications

EngineChevy 5.3Chevy 6.2
Engine FamilyGM EcoTec3GM EcoTec3
Model Years2019-Present2019 – Present
Displacement5.3 Liters6.2 Liters
ConfigurationV8V8
AspirationNaturally AspiratedNaturally Aspirated
Compression Ratio11.0:111.5:1
Head/Block MaterialAluminumAluminum
Bore & Stroke3.780 x 3.622 inches4.065 x 3.622 inches
Fuel SystemDirect InjectionDirect Injection
Valve TrainOverhead Valve (2 valve/cy)Overhead Valve (2 valve/cy)
Horsepower Output355 horsepower420 horsepower
Torque Output383 lb-ft of torque460 lb-ft of torque

Chevy 5.3 comes with 355 hp and 383 lb-ft of torque. The L84 includes GM’s Dynamic Fuel Management (DFM). It is paired with a 10-speed automatic transmission. GM 5.3 features a 3.78-inch cylinder bore and a compression ratio of 11.0:1. The fuel economy is 16 mpg in the city and 23 mpg on the highway.

The 6.2 surpassed 5.3 in terms of horsepower, with a rating of 420 hp. Chevy 6.2 engines have higher torque ratings at 460 lb-ft of torque. This engine is also mated to a 10-speed automatic transmission. GM 6.2 engines have bigger cylinder bores (4.06) than 5.3, and a compression ratio of 10.7:1. For 6.2L, you’ll get 15 mpg in the city and mpg on the highway.

Design Differences

Since both the L84 and L87 are a part of the Chevy EcoTec3 engine series, they do share quite a few similarities in terms of their overall design. Down to the most basic level, both engines are overhead valve V8s that have all aluminum construction. The main difference between the engines is displacement. With a bore and stroke of 4.065 x 3.622 inches, the 6.2L has 0.9L of additional displacement compared to the 5.3L with a bore and stroke of 3.780 x 3.622 inches.

Most of the other design differences revolve around the rotating assembly components. Since the 6.2L is a significantly more powerful engine than the 5.3, it uses stronger materials for the crankshaft, camshaft, and connecting rods. While the 5.3’s rotating assembly is essentially all cast iron, the 6.2L uses a forged steel crankshaft, billet steel cam, and forged powder metal connecting rods.

The engines also use different forms of fuel management, with the 5.3L using the more antiquated Active Fuel Management that was used on the L82 V8 and the 6.2L using the newer Dynamic Fuel Management system.

Chevy 5.3 vs 6.2 Towing Capacity

At the end of the day, Chevy designed both the 5.3 and 6.2 to be excellent engines for towing. Both provide more than adequate power and torque to haul serious payloads, especially when looking at the Silverado and Sierra. With that being said, the 6.2L does take the edge when it comes to towing ability, mostly thanks to its additional 77 lb-ft of torque. The 6.2’s additional 65 horsepower also helps to keep the truck and payload moving once you’re up to speed.

The Chevy Silverado’s 5.3L V8 engine produces 355 horsepower and 383 lb-ft of torque. This engine has an 11,300-pound towing capacity.

A Chevy Silverado with a 6.2L V8 engine produces up to 420 hp and 460 lb-ft of torque, giving it the highest V8 towing capability of 1,300 pounds. The 6.2L engine outpaces the 5.3 engine in towing capacity.

Reliability

The Chevy 5.3 is popularly known for its reliability. Depending on how well you maintain your 5.3 L engine, it should last between 200,000 and 300,000 miles.

The 6.2L engine is one of the company’s most reputable and powerful engines. The Chevy 6.2 engine has proven to last over 250,000 miles. It is by far the most reliable engine.

Engine Applications

Chevy 5.3 vehicle applications include GMC Yukon, Chevrolet Silverado, Chevrolet Suburban, GMC Sierra, and Chevrolet Tahoe.

The 6.2 engine is available in the Chevy Silverado 1500, Tahoe, Suburban, GMC Sierra 1500, Yukon XL, Yukon, and Cadillac Escalade.

Chevy 5.3 Vs. 6.2 Common Problems

So far, both the 5.3 and the 6.2 V8 have shown themselves to be very reliable engines. While they are both too new to truly show the common problems that they’ll face later down the line, going off of evidence from previous EcoTec engines, they should easily run for well over 150,000 miles without requiring rebuilds or any significant issues.

However, both have also shown themselves to be susceptible to a number of problems. Overall, we would still call both the Chevy 5.3 vs 6.2 V8s reliable engines, but there are a few issues you should be aware of with each.

Chevy 5.3’s Most Common Problems

  • Excessive Oil Consumption
  • Intake Manifold Issues

1) Excessive Oil Consumption

A 5.3-liter engine is quite prone to high oil consumption. When GM switched to an Active Fuel Management system, the engine began consuming an unusually large amount of oil. This problem was later traced back to the Active Fuel Management system. Its purpose was to improve fuel efficiency. The system operates by shutting down some of the engine’s cylinders to save fuel. Simply turning off the AFM will solve the problem.

This problem was also compounded by a malfunctioning oil monitoring system. The oil monitoring system informs the driver when the oil level is low and needs a refill.

There are various repercussions of driving without enough oil in the engine for an extended period. If it comes down to it, repairing this issue could cost you thousands of dollars. So you should check the oil level and fill it up with the right amount for your Chevy 5.3.

2) Failure Of Intake Manifold Gaskets And Intake Manifolds

Intake manifold gaskets are among the vital parts of an engine. The intake manifold’s job is to make sure air is equally distributed to each of the cylinders. Fuel combustion needs air. If the intake manifold isn’t working properly, the engine will suffer. Because the cylinders will not fire properly.

On the other hand, the intake manifold gasket keeps the intake manifold and cylinder head together. It prevents any air from exiting as it enters the cylinders.

Also, Chevy factory-installed gaskets are originally made of plastic. Many 5.3 engines experience gasket deterioration due to wear and tear. Furthermore, intake manifolds made of plastic are similarly susceptible to cracking.

Symptoms of a faulty intake manifold gasket include leaks, rough idling, overheating, poor fuel economy, and loss of acceleration. Long-distance driving with a bad intake manifold gasket can be dangerous. Contact a technician to have it inspected and repaired immediately.

Chevy 6.2’s Most Common Problems

  • Power Loss Warning
  • Engine Knock
  • Stall While Driving

1) Power Loss Warning

This appears to be one of Chevy 6.2’s common issues. The power loss warning gets activated when your vehicle’s performance is compromised. This means that there’s a system failure.

As a result, your 6.2L engine will fail to accelerate and your car will begin to slow down. Usually, there is more than one likely underlying cause for the Chevy 6.2L power loss warning. It might be a spark plug, clogged exhaust system, loose fuel cap, malfunctioning oxygen sensor, fuel filter, or something else.

You shouldn’t ignore the warning light on your dashboard. To avoid further harm, you should have it examined as soon as possible.

2) Engine Knock

The constant engine knock in your Chevy 6.2 is most likely caused by piston wear. As the pistons jump back and forth inside the cylinders, they may become worn out or lose their position. If left unchecked, they may fall apart. The best solution is to get a replacement. Make an appointment with a professional to have it checked right away.

3) Stall While Driving

When your engine stalls, it can be both terrifying and annoying. Despite its many advantages, the Chevy 6.2 has the propensity to stall when driving.

A shortage of oil is the most likely cause of your car stalling. It’s advisable to take it to the dealership or a professional to fix it.

Summary

The Chevy 5.3 and 6.2 engines are both regarded as very reliable. But this does not mean that these engines are immune to problems. If you notice similar problems with your Chevy engine, you should get professional service as soon as possible to avoid further problems.

However, many of the problems usually happen in the old models with poor maintenance. So, in general, both Chevy 5.3 and 6.2 are great options that you should try.

Also, let us know if you ever experienced any issues with these cars. Do you have any ideas of which engine has a higher value compared to the other? Comment below!

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