The Chevy Silverado is one of the best-selling trucks in the USA. The truck comes with many engine options, but the most popular is the 5.3L EcoTec3 V8. It’s also one of the best trucks to try out a ton of cool mods and upgrades. If you want to tune up your Silverado, the engine is probably the first thing on your list. To improve an engine’s performance though, you can do more than just change the air intakes and filters, you can improve it with other parts too, like spark plugs. It’s important to replace the spark plugs for better performance and fuel consumption.

Let’s have a look at what we think are the best spark plugs for 5.3 Silverado.

[If you don’t have a Silverado and you’re looking for the Best 5.3 Vortec Spark Plugs, we have a guide for that too!]

The 5 Best Spark Plugs for 5.3 Silverado:

  1. NGK # 1465 Laser Iridium Spark plugs IZTR5B11 – the best spark plugs for 5.3 Silverado
  2. ACDelco 41-110 Iridium Spark Plugs 12680072
  3. ACDelco 41-114 Professional Iridium Spark Plugs 12622411
  4. Bosch 9602 Double Iridium Spark Plug
  5. E3 Spark Plug E3.54 Automotive Spark Plug

Our Recommendations

Preview
Hard-wearing with the best value
NGK # 1465 Laser Iridium Spark Plug IZTR5B11 --- 8 PCSNEW
Best stock replacement
ACDelco -12680072 41-110 Professional Iridium Spark Plug (Pack of 4)
The least carbon emissions
ACDelco 41-114 Professional Iridium Spark Plug (Pack of 1)
The most efficient of the lot
Bosch 9602 Double Iridium Spark Plug, Up to 4X Longer Life, Pack of 4
Best upgrade for superior performance
E3 Spark Plugs E3.54 Automotive Spark Plug (1)
Name
NGK # 1465 Laser Iridium Spark Plug IZTR5B11 --- 8 PCSNEW
ACDelco -12680072 41-110 Professional Iridium Spark Plug (Pack of 4)
ACDelco 41-114 Professional Iridium Spark Plug (Pack of 1)
Bosch 9602 Double Iridium Spark Plug, Up to 4X Longer Life, Pack of 4
E3 Spark Plugs E3.54 Automotive Spark Plug (1)
Our Rating
Prime
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-
-
Iridium Tipped Electrode
Laser welded tipped
Ground electrodes
One
One
One
One
Three
Hard-wearing with the best value
Preview
NGK # 1465 Laser Iridium Spark Plug IZTR5B11 --- 8 PCSNEW
Name
NGK # 1465 Laser Iridium Spark Plug IZTR5B11 --- 8 PCSNEW
Our Rating
Prime
-
Iridium Tipped Electrode
Laser welded tipped
Ground electrodes
One
Details
Best stock replacement
Preview
ACDelco -12680072 41-110 Professional Iridium Spark Plug (Pack of 4)
Name
ACDelco -12680072 41-110 Professional Iridium Spark Plug (Pack of 4)
Our Rating
Prime
Iridium Tipped Electrode
Laser welded tipped
Ground electrodes
One
Details
The least carbon emissions
Preview
ACDelco 41-114 Professional Iridium Spark Plug (Pack of 1)
Name
ACDelco 41-114 Professional Iridium Spark Plug (Pack of 1)
Our Rating
Prime
-
Iridium Tipped Electrode
Laser welded tipped
Ground electrodes
One
Details
The most efficient of the lot
Preview
Bosch 9602 Double Iridium Spark Plug, Up to 4X Longer Life, Pack of 4
Name
Bosch 9602 Double Iridium Spark Plug, Up to 4X Longer Life, Pack of 4
Our Rating
Prime
-
Iridium Tipped Electrode
Laser welded tipped
Ground electrodes
One
Details
Best upgrade for superior performance
Preview
E3 Spark Plugs E3.54 Automotive Spark Plug (1)
Name
E3 Spark Plugs E3.54 Automotive Spark Plug (1)
Our Rating
Prime
Iridium Tipped Electrode
Laser welded tipped
Ground electrodes
Three
Details

REVIEWS YOU CAN TRUST 

We strive to always give you genuine, accurate information. To do this, all of mechanicguides.com reviews are based on market research, expert input, and practical experience. This knowledge comes from a team of automotive journalists and an independent mechanic, Steve “Whip” Whipple who has 11 years of experience in the auto industry. For more information, see here.

Hard-wearing with the best value: NGK # 1465 Laser Iridium Spark plugs IZTR5B11 — the best spark plug for 5.3 Silverado

NGK # 1465 Laser Iridium Spark Plug IZTR5B11 --- 8 PCSNEW
74 Reviews

The NGK laser iridium spark plug is a great option for a better upgrade for the Silverado 1500, 2500 and 3500 models. The spark plug is made to last using the finest laser-welded technology. Because of the iridium and platinum disks at either end of its electrode, you’ll get a spark plug that helps maintain the performance of the engine and still retains its sharp edges. Iridium and platinum metals are tougher and have higher melting points than traditional metal.

Laser welded iridium and platinum-tipped electrodes

NGK uses laser-welding technology to achieve their high-precision polished welding. This method uses pinpoint accuracy to weld with excellent depth to width ratio and high strength. The center electrode of the spark plug is welded with an iridium disk and the ground electrode is welded with a platinum disk so the spark plug won’t wear out quickly. Because of the iridium disc, you’ll get durability and longer life than any other metal.

Which Silverado models can use this spark plug?

This spark plug is compatible with the Silverado 1500, 2500 and 3500. It’s compatible with the following 1500 models: Silverado 1500 (1999-2013), 1500 HD (2001-2006), 1500 Classic (2007) and 1500 HD Classic (2007). This spark plug can also work with the Silverado 2500 (1999-2004), 2500 HD (2001-2018) and 2500 HD Classic (2007) as well as with a few 3500 models such as 3500 (2001-2006), 3500 Classic (2007) and 3500 HD (2007-2018). If you have any questions about compatibility, please message the seller.

Why do we like it?

This laser iridium spark plug is a great choice for your truck because it promises to last longer than the conventional spark plug. Its iridium and platinum combination make the spark plug more durable with the added ability to increase your truck’s performance and improve mileage.

Pros

  • Laser welded electrodes
  • A fusion of iridium and platinum

Cons

  • None

Best stock replacement: ACDelco 41-110 Iridium Spark Plugs 12680072

ACDelco -12680072 41-110 Professional Iridium Spark Plug (Pack of 4)
405 Reviews
ACDelco -12680072 41-110 Professional Iridium Spark Plug (Pack of 4)
  • Iridium offers better engine idle stability and smoother performance
  • Iridium allows for smaller, more efficient electrode designs for improved cold starting and quicker acceleration
  • Iridium fine-wire electrode helps improve ignition of the fuel and burns away carbon deposits on the tip of the plug as they form, to help improve fuel economy
  • One piece suppressor seal blocks radio frequencies that can affect vehicle electronics
  • Suppressor seal meters spark energy for longer electrode life and seals against combustion leakage

If you’re searching for a spark plug that can last four times longer than your vehicle’s stock spark plug, your search ends here. The ACDelco 41-110 iridium spark plug offers more miles as well as improvement in power output. This iridium spark plug retains its edges on both the electrodes for thousands of miles.

Iridium spark plug with boosted endurance

This Iridium spark plug is the best replacement for the 5.3 Silverado’s stock spark plug because the Iridium metal lasts longer than traditional copper and nickel alloy spark plugs. You’ll get smooth performance as well as unfailing cold starts. Fine-wire technology also provides better ignitability and durability. This spark plug also helps to maintain the performance of the truck.

Which Silverado models can use this spark plug?

This spark plug is compatible with most of the Silverado models, such as Silverado 1500 (1999-2013), 1500 Classic (2007) and Silverado 2500 (1999-2000).

Why do we like it?

The ACDelco Iridium Spark Plug can be a good upgrade for your truck because it offers great durability and tends to last four times more than the conventional spark plug. The iridium tip not only provides maximized durability, but it also helps maintain the engine power.

Pros

  • Iridium tip electrode
  • Durability

Cons

  • Price

The least carbon emissions: ACDelco 41-114 Professional Iridium Spark Plugs 12622411

ACDelco 41-114 Professional Iridium Spark Plug (Pack of 1)
47 Reviews
ACDelco 41-114 Professional Iridium Spark Plug (Pack of 1)
  • Iridium offers better engine idle stability and smoother performance
  • Iridium allows for smaller, more efficient electrode designs for improved cold starting and quicker acceleration
  • Iridium fine-wire electrode helps improve ignition of the fuel and burns away carbon deposits on the tip of the plug as they form, to help improve fuel economy
  • One piece suppressor seal blocks radio frequencies that can affect vehicle electronics
  • Suppressor seal meters spark energy for longer electrode life and seals against combustion leakage

The 41-114 Professional Iridium spark plug is another great product from the ACDelco  company. It contains an iridium tipped electrode for smooth acceleration and mileage of the truck. Iridium is said to be harder and stronger than platinum as well as has a higher melting point.

Improved mileage and high-performance

This spark plug not only increases performance, but it also provides better combustion and more efficient burning of the air and fuel mixture. An iridium spark plug has more significant advantages than the regular metal spark plug. Fine-wire technology in the iridium spark plug burns off carbon deposits as they form. The size of the iridium-tipped central electrode is half of the size of the platinum electrode. Therefore, you need less voltage to provide better fuel economy, combustion, and lower emissions.

Which Silverado models can use this spark plug?

ACDelco 41-114 iridium spark plug is compatible with Silverado 1500 (2014-2020) and 1500 LD (2019) models.

Why do we like it?

This iridium spark plug will help to improve the fuel efficiency and performance of your truck. Because Iridium has excellent longevity you won’t need to replace your spark plugs often either. This ACDelco iridium spark plug also provides great engine idle stability as well as reliable cold starting.

Pros

  • Enhanced performance
  • Better mileage

Cons

  • Price

The most efficient of the lot: Bosch 9602 Double Iridium Spark Plug

Bosch 9602 Double Iridium Spark Plug, Up to 4X Longer Life, Pack of 4
145 Reviews
Bosch 9602 Double Iridium Spark Plug, Up to 4X Longer Life, Pack of 4
  • Double Iridium firing pin and ground electrode inlay provide 4X longer service life compared to standard copper plugs
  • 0. 6mm fine wire firing pin provides superior ignitability and performance
  • 360° continuous laser weld fuses corrosion resistant iridium firing pin to base for increased durability
  • 7 year performance satisfaction
  • Original equipment, pre-gapped replacement delivering optimum fit, form and function

Bosch’s 9602 Double Iridium spark plug not only increases the power output and torque, but it also lasts longer than any conventional spark plug. Its special tip also allows it to last four times longer than standard spark plugs, so you don’t need to be concerned about changing it often.

Double Iridium spark plug with laser welded tip

The great performance comes from the ultra-fine wire design and laser welded tapered ground electrode. The 0.6 mm fine wiring pin delivers excellent ignitability which improves the power output of the truck and fuel economy too. This iridium spark plug can last up to 100,000 miles, depending on your driving conditions.

Which Silverado models can use this spark plug?

The Bosch Double Iridium spark plug is compatible with Silverado 1500 (2000-2013) and 2500 (2000) models.

Why do we like it?

Bosch’s Double Iridium spark plug offers high quality at a good price. This spark plug comes with an iridium firing pin and iridium ground electrode inlay which makes it tougher than the standard spark plug.

Pros

  • Double iridium electrodes
  • Value for money

Cons

  • None

Best upgrade for superior performance: E3 Spark Plug E3.54 Automotive Spark Plug

Sale
E3 Spark Plugs E3.54 Automotive Spark Plug (1)
169 Reviews
E3 Spark Plugs E3.54 Automotive Spark Plug (1)
  • Near elimination of performance inhibiting carbon deposits, dramatically longer plug life and a 5-year/100,000 mile limited warranty
  • DiamondFire electrode technology that creates a superior spark and resulting flame front extending further into the cylinder, producing more localized pressure
  • Significant potential power increase: > 6% to 12% (depending on engine class)
  • Significant potential fuel efficiency improvement: > 4% to 13% (depending on engine class)
  • See manufacturer website for application information.

The E3 Spark Plug E3.54 has diamond fire technology that uses three ground electrodes to enable the flame to spread in a wider area as well as create lower pressure compared to traditional spark plugs. As a result, the engine produces more power and torque while consuming less fuel.

Diamond fire electrode technology to improve overall performance

The diamond fire feature of this E3 spark plug can be useful for your truck because it ensures a smoother running engine. You’ll get a more efficient performance through the three electrodes design that extends the flame’s reach to burn most of the air and fuel mixture.

Which Silverado models can use this spark plug?

E3 Spark plug E3.54 is compatible with Silverado 1500 (1999-2012), 1500 Classic (2007) and 2500 (1999-2000) models.

Why do we like it?

Because this E3 spark plug has a unique three ground electrode design you’ll get an increase in the power output of the truck and improved mileage as well. If you live in cold weather conditions, this spark plug will also get your truck to start the first time. It’s a great option if you want something that’s a good balance of features and value.

Pros

  • Three ground electrodes
  • Price

Cons

  • No iridium tip electrode

What are the best spark plugs for 5.3 Silverado?

If you’re interested in upgrading your 5.3 Silverado’s spark plug or if you’re just looking to replace the old, worn-out one, we’ve hopefully given you some ideas on what to buy. With any of these spark plugs, your Silverado will have improved engine power output, better torque, and less fuel consumption. Traditional spark plugs use copper and nickel alloy but now with the latest technology they use more durable and stronger metals like iridium and platinum to create the electrode tips of the spark plug.

In a nutshell, the NGK laser spark plug and Bosch Double Iridium spark plug offer the best durability. They both have iridium tipped electrodes which provide great longevity and adds extra miles in the truck’s range. ACDelco spark plugs are good, ACDelco 41-110 and 41-114 offer iridium tipped electrodes, but they are a bit pricey. Although the E3 spark plug offers three ground electrodes as a result of better spark and better combustion, the spark plug doesn’t have an iridium tipped electrode.

Benefits of replacing your spark plugs on a 5.3 Silverado

If you know about vehicles, it must be pretty clear to you that the spark plug is an essential component in the engine. It can very much make or break the engine — depending on its own health. But like every component, the spark plugs also come with a predefined life. You can stick to the manufacturer’s recommended intervals to change the plugs, or lookout for signs of the plugs failing and then change those — the latter is not recommended as it puts both you and your beloved four-wheeler at risk. Once you switch from old plugs to new ones, there are quite a few benefits to be enjoyed. And you won’t take too long to appreciate the money you’ve put into getting the new ones. We take a look at the benefits of replacing your spark plugs on a 5.3 Silverado.

Added performance

While increasing performance just with the use of new spark plugs is questionable, going from a set of old plugs will make the difference way more apparent. If you’ve got the conventional plugs that your Chevrolet Silverado 5.3 originally came with, you won’t be promised any gains. With the platinum or iridium spark plugs, there’s a chance the salesperson will make you believe that there will be some performance improvement.

But that’s not the point here. You see as the plug works continuously mile after mile, it gets some deposits on it. This continues for thousands of miles, without the spark plug throwing a fit — and working the way it’s intended over its entire life. When you go from that to a clean, rightly gapped spark plug, you’re bound to notice the vehicle’s performing better. It might not be the biggest change, but it depends on the kind of spark plug you’re coming from.

So if the plug you just replaced was in a sorry state, your Chevrolet Silverado will now be smoother. It will also have consistent performance, without any stutters or a sudden surge of power. Other adverse effects of using bad spark plugs will also be gone (if you were experiencing those because of faulty plugs) — like misfires or the engine’s inability to start.

Improved Fuel Efficiency

One more problem with using bad spark plugs is that they increase fuel consumption. Not just does your Silverado guzzle up all the gas quicker, but it doesn’t quite go faster. And that’s because, in the case of a faulty plug, the engine has to work harder to make progress on fewer cylinders than before. This means while the engine takes in as much air-fuel as it normally would, the end result isn’t quite the same.

Switching to new plugs will mean there will be no anomaly, and hence the engine will run optimally — as far as the spark plugs are concerned. So there will be no extra wastage of gas, and thus the fuel used will be turned into meaningful progress on the road. This will be noticeable as you’ll make fewer trips to the gas station. And that, of course, has both economic and environmental benefits.

Fewer chances of other failures

Having bad spark plugs can have adverse effects on other components/systems in a car/truck. For instance, a plug with heavy deposits or an incorrect gap isn’t just going to not perform at its best, it will also exert an extra load on the battery and ignition system. This means it’s going to eventually affect other components in the electrical or ignition system. And that might not be something to worry about in the short run, but you may end up with a long bill if you continue to drive the Silverado 5.3 with a faulty plug.

Misfires can also affect the vehicle’s exhaust system, mainly the catalytic convertor. And this small negligence can lead to a bigger expense if the cat-con fails. In which case, not only will your Chevrolet Silverado pass the necessary emission tests, a new exhaust system including a catalytic converter is going to be a very expensive affair.

If you get a new spark plug to replace the faulty one, you reduce the chances of such failures. And that’s the wise thing to do.

Longer Life

The thing about replacing spark plugs is that it gives you the opportunity to choose better aftermarket plugs. These come in a variety of options: you can choose one with a different-shaped ground electrode, one with platinum tips, or the best ones out there: iridium plugs. All these, apart from performance improvements, come with improved durability. 

Platinum plugs make for a great intermediate solution — as these aren’t as expensive as the iridium ones but still offer a longer life than the conventional plugs. Apart from the added longevity, these also perform slightly better than the conventional ones. But should you decide to go for iridium plugs, you don’t just get even better performance but also an even longer life. Iridium plugs exert less load on the ignition system, which is a solid bonus if you’re looking and caring for the Chevrolet SUV in the long run.

Although these are more expensive than the standard spark plugs, you do get what you pay for. So for instance, if you choose a set of iridium plugs, you can be sure that it’s going to last longer than the previous set — as long as you keep compatibility in mind. And this can be exceptionally helpful if you’re looking at saving labor costs. Another benefit is easily appreciated on those vehicles that have difficult access to the spark plugs. If you pick a plug that lasts long, it’ll take a while before you have to replace those. And that’s a sure-shot win.