8 Best Spark Plugs for 6.0 Chevy [Buying Guide 2021]

Engine maintenance in one delicate part to keep the vehicle running properly. And one integral accessory is a spark plug to initiate the startup ignition.

You’re to replace the existing ones after a standard time frame. It’s true for every vehicle to hit the road, including the popular 6.0L Chevy models.

But there are lots of models available to mess with your ultimate purchase. You’ll have to get the absolute best spark plugs for 6.0 Chevy at once.

That’s where we narrowed the most suitable options with comprehensive details. We certainly took the time to represent superior replacement options.

You may look into the quick comparison below to get the preliminary insight.

Best Spark Plugs for 6.0 Chevy – Comparison Table

ProductMaterialKey FeatureFitmentPrice
1. NGK 5464 BKR5EIX-11 IX Spark PlugIridiumTapered Ground Electrode1991 – 2012
2. ACDelco -12680072 Professional Spark PlugIridiumTrue GM Specifications1998 – 2014
4. DENSO #4511 T T Spark PlugsPlatinumModified Twin-Tip Design1996 – 2008
3. NGK (3657) IZFR5K-11 Laser Spark PlugIridiumPlatinum Disc Welding2002 – 2013
5. ACDelco 41-993 Professional Spark PlugIridiumEfficient Electrode Design1991 – 2006
6. Denso 3473 Spark PlugIridiumProtective Metal Top2005 – 2014
7. NGK # 1465 Laser Spark Plug IZTR5B11IridiumPremium Laser Welding2002 – 2014
8. Autolite HT15 High Thread Spark PlugPlatinumGround Shield Strap2002 – 2007

8 Best Spark Plugs for 6.0 Vortec Reviews

You have the basic comparison to check the picks at a glance. Now, it’s time to dive deep into the necessary details. You better check every Chevy 6.0 spark plug review individually right below.

1. NGK 5464 BKR5EIX-11 IX Spark Plug

NGK 5464 BKR5EIX-11 IX Spark Plug

Let the model take out all engine issues over defective spark plugs.

NGK achieves a special place in the automotive industry with ignition plugs. And it develops BKR5EIX-11 specifically to ensure optimum startup serviceability.

Ignition, response, anti-fouling – the set manages to push the overall action forward. Of course, the price tag remains within a certain affordable budget.

Features & Benefits

Iridium Alloy

The featured metal covers for integrated electrodes towards better ignitability. A higher melting point keeps it tolerable against electrical heat. Trivalent metal plating initiates superior resistance to corrosion & rust.

Long Insulator Nose

The built-in insulator comes with a reasonably long nose measurement to prohibit fouling. Meanwhile, protective corrugated ribs on the insulator prevent flashover. Standard triple gasket sealing eliminates the possibility of combustion gas leakage.

Laser Welded Tip

Fine iridium tip integrates 0.6mm laser welding to impart further durability. Consistent spark stability prevents dry startup ahead of engine action. Also, tapered ground electrode minimizes electrical quenching on the run.


  • Extended structural durability.
  • Smooth startup at all conditions.
  • No flashover, fouling, or gas leak.
  • Superior resistance to seizing.


  • Issues with pre-gap distance.


2. ACDelco -12680072 41-110 Professional Spark Plug

ACDelco -12680072 41-110 Professional Spark Plug

Top-quality replacement comes to keep the engine functional against all adversity.

ACDelco is another reputed brand in the automotive industry with different gears. It has a 12680072 plug set to initiate a stable ignition towards a startup.

Fir, form & function – key features of the best spark plugs for GM 6.0 deliver optimum efficiency. And the price requires a certain budget for conscious buyers.

Features & Benefits

Iridium Structure

Iridium possesses convenient advantages to support the engine ignition mechanism. Greater idle stability triggers smooth performance on the road. Effective electrode design manages to call for faster acceleration.

Suppressor Block

The integration of the suppressor seal helps with the metering of spark energy. It prevents gas leakage without sacrificing the electrode life. And the seal obstructs radio frequencies to interrupt.

Easy Maintenance

Fine wired electrode dissolves gradually building a deposit on its tip. Reduction in waste burning leads to the enhancement of fuel economy. The cleanliness allows low maintenance on plugs to uphold the efficiency.


  • Improved cold engine startup.
  • High tolerance against stress.
  • Quick acceleration on demand.
  • Integration of protective seals.


  • Somewhat poor packaging.


3. DENSO #4511 T T Spark Plugs

DENSO #4511 T T Spark Plugs

Check out the defective system with the improved set to support ignition.

Not lots of brands can outmatch Denso in terms of quality automotive parts. And its #4511 spark plug simply proves the reliability.

The 6-pieced best spark plugs for 6.0 LS comes ready to deliver maximum engine performance. For the price, it’s righteous enough against the offered benefits.

Features & Benefits

Twin-Tip Design

Premium twin-tip action initiates extended reliability with improved ignition. The cutting-edge tech includes a platinum-titanium combo to minimize erosion. The central electrode has platinum whereas the ground electrode has a titanium-enhanced alloy.

Sparking Energy

High accuracy in ignition immediately optimizes the overall engine mechanism. Again, the second ground electrode tip induces spark growth. The extended operation goes beyond 60000 miles, saving fuel on long-road drives.

Great Longevity

Resistance to corrosion, erosion & rust upholds durability in any condition. Minimal maintenance will remain sufficient to support efficiency. No more poor economy or engine misfire to distract the attention.


  • Unobstructed growth of spark.
  • Standard fitting measurement.
  • Least tip corrosion and erosion.
  • The constant upholding of its gap.


  • Little info on specs.


4. NGK (3657) IZFR5K-11 Laser Spark Plug

NGK (3657) IZFR5K-11 Laser Spark Plug

Take care of engine ignition & followed startup with premium choices.

NGK comes with another high-quality spark plug to meet the demands. Its featured IZFR5K-11 aims at reducing deteriorating elements from the core.

The design pictures considerable similarities with the very first option. A satisfactory price-to-quality ratio has to draw the attention of interested buyers.

Features & Benefits

Powerful Electrode

The central electrode included a durable iridium alloy for its tip. In the meantime, the ground electrode features a unique platinum disc. The disc remains welded to the backside to induce further longevity.

Supporting Action

Integrated trivalent metal plating imparts resistance to seizing & corrosion. Lower emission on startup helps with the improved fuel economy. And faster startup causes quick acceleration without sacrificing the smoothness.

Reduced Damage

A long insulator nose eliminates the chance of fouling. Likewise, there are corrugated ribs to prevent flashover. Standard sealing in the form of gasket takes out combustion gas leakage.


  • Protective structural exterior.
  • Durable electrode mechanism.
  • Higher consistency in the ignition.
  • Improve fuel consumption.


  • Barely noticeable mileage.

5. ACDelco 41-993 Professional Spark Plug

ACDelco 41-993 Professional Spark Plug

Eliminate all the disgusting engine startup problems occurring over defective ignition.

Another ACDelco makes the top list with one high-quality ignition support. The premium aftermarket replacement meets all the OEM requirements at once.

The brand itself promises maximum fit, enduring form & optimum function. You just have to settle down for its reasonable price tag.

Features & Benefits

Original Accessory

True GM supported equipment gets to work with the ignition system. Gap, fit, install – everything remains incredibly simple yet friendly. The design comes with superior efficiency to initiate the burning spark.

Iridium Electrodes

Entire construction features highly durable iridium to prevent unwanted occurrences. Further idle stability results in smooth running on the pitch. Faster acceleration becomes unobstructed, thanks to the improved cold startup.

Suppressing Seals

A built-in suppressor seal reduces the chance of early electrode failure. It prevents the much-debated combustion gas leakage. Blocking of interrupting radiofrequency protects internal electronics.


  • Highly protective exterior shell.
  • Standard fine-wired iridium tip.
  • Consistent generation of energy.
  • Low maintenance requirement.


  • Slightly short thread section.


6. Denso 3473 Spark Plug

Denso 3473 Spark Plug

Ignite the fuel mix effectively without sacrificing another involved accessorial efficiency.

Denso is one reasonable brand with lots of supporting automotive gears. And its 3473 introduces the best spark plugs for 6.0 Vortec to aid engine issues.

There are numerous benefits to keep the model in your primary checklist. The price may seem harsh, not exceeding the budget of conscious buyers.

Features & Benefits

Durable Iridium

Likewise, iridium covers the essential parts from top to bottom. Iridium itself remains stronger than standard platinum. Therefore, you can expect a satisfactory service life against interior mechanical stress.

Protective Outer

A high-strength metal casing keeps the surrounding away from the electrodes. The casing barely experiences any deteriorating rust or corrosion. Obviously, the additional cover imparts further tolerance against elements.

Superior Action

Virtually, zero electrode wear takes place to curtail performance. Hex sized bottom sits immediately. Gasket seat, resistor, solid terminal nut – everything works to extend the reach. You can rely on efficiency for sure.


  • Premium structural design.
  • Solid fitment for installation.
  • No leak with gasket sealing.
  • Protective engine ignition.


  • Slightly distorted gapping.


7. NGK # 1465 Laser Spark Plug IZTR5B11

NGK # 1465 Laser Spark Plug IZTR5B11

Make the ultimate replacement to enjoy the most effective engine response on startup.

As it happens, NGK covers a good portion of the topmost picks. Its featured IZTR5B11 has every reason to support your engine requirements.

Incredible improvement in the overall design keeps it simple yet effective. You ought to pay the price tag demanded its service.

Features & Benefits

Iridium Electrodes

Unlike platinum, iridium offers better performance in comparison to platinum. And NGK utilizes high-quality iridium to structure the electrodes. You’ll receive further spark energy without giving up on durability.

Protective Action

Laser welded tip imparts superb resistance to corrosion & damaging elements. Thick metal exterior withstands the heavy internal pressure & heat. The plug remains secure till the very end of its intended lifespan.

Simplified Operation

Installation remains pretty simple, without costing additional gears or effort. The fitting design immediately sits on the targeted position. And maintenance is incredibly easy all along.


  • Premium laser iridium tip.
  • Extended frame durability.
  • Increase in fuel economy.
  • Simple installation process.


  • Initial fitment issues.


8. Autolite HT15 High Thread Spark Plug

Autolite HT15 High Thread Spark Plug

No more engine problems to encounter with defective or aged-out ignition plugs.

Autolite has its place in the automotive industry through specific gears. And its HT15 covers the highest level of supporting spark plugs.

Uncompromised built quality makes the Chevy 6.0 best spark plugs rather useful. Of course, you’ll receive a reasonable price-to-quality ratio.

Features & Benefits

Durable Metal

Platinum electrodes have to provide some benefits over iridium. Integrated fine-wired tip initiates some increase in horsepower. Lower exhausting emission triggers the retention of wasteful fuel costs.

Intact Exterior

Extremely hard steel alloy protects the plug from exterior elements. Additional structural strength upholds the ignition consistency against internal stress. And the modified physical spec helps with the installation.

Heat Transfer

There comes a one-piece shield strap on the ground electrode bottom. The OE-patented design offers consistent optimal performance. Improved, unobstructed & smooth heat transfer prevails throughout the operation.


  • Inclusion of special socket.
  • Standard fitting dimension.
  • Almost zero-gap erosion.
  • Betterment in the economy.


  • Limited compatibility.


How Does a Spark Plug Work?

Spark plugs tend to function as one heat exchanging accessory. It simply pulls out the unnecessary thermal energy from the burning chamber. The design merely produces heat; instead, it works to remove excess heat.

The connection between the high-voltage generating ignition coil with the spark plug initiates the primary circuit. The ignition circuit induces a high-voltage current right into the central electrode. Not to mention, the flow of electrons through the coil imparts deviations in voltage.

The difference takes place between the central electrode & the ground electrode. When the voltage exceeds the gases’ dielectric strength, the fuel gets vaporized. The ionized gas starts to act like a conducting medium to support electron flow. It’s more like electrical energy waiting to go further.

The induced current transmits through the electrode ahead of jumping the ground electrode gap. The surging of electrons raises the internal temperature to a sparkling 60000K. Intense heat inside the spark channel causes the gas to expand rapidly.

The satisfactorily high voltage causes the plug ends to initiate the spark. In fact, the gaseous expansion triggers some small-scale explosions. The action completes the secondary circuit to power up the igniting spark.

A triggered “Click” sound occurs to light up the fuel mixture. The size of the fireball or kernel in the chamber directly depends on the mixture composition. Inside the combustion chamber, the gas/fuel mixture gets a solid, stable, supporting spark to trigger the burning.

What Happens When Spark Plugs Go Bad?

Every spark plug has its designed lifespan to serve the mechanical function. Upon the end, it starts to show certain issues with engine performance. Not to mention, defective/improper/poor plugs also lead to the same symptoms.

You may experience one/two problems at a time. It’s also possible to encounter several problems in high intensity. Therefore, you should know the aftermath of failing spark plugs.

  • Hard, Rough, Difficult Startup Starting the engine becomes difficult every time. Rougher idling has to accompany the issues to worsen the condition.
  • Noticeable Lack in Acceleration The chamber lacks sufficient consistency in igniting spark. And it results in difficulty in wheel acceleration.
  • Frequent Engine Misfires The engine starts to misfire every now & then. A defective ignition system controls the frequency in its occurrence.
  • ‘Check Engine’ Light Turns On Internal mechanism faces troubles to perform the intended function. And it turns on the Check Engine Light on the dashboard.
  • Reduction in Gas Mileage Wasteful burning gets to increase in amount on a longer drive. You’ll have to visit the refilling station rather often.
  • Constant Surging/Hesitation The fuel mix inside the chamber requires more igniting spark. Deficiency in spark induces mechanical surging or hesitated engine action.
  • High Noise, Heavy Vibration Interior vibration tends to increase with the troubled fuel burning. Likewise, additional vibration leads to humming noise.

Not to mention, the interconnected parts ultimately leads to the issues. Therefore, you need to determine the actual cause of every aforementioned symptom.

What Can Go Wrong When Changing Spark Plugs?

  • Once installed, it’s essential to check out the engine functionality. Garage tests should reveal problems regarding Chevy 6.0 spark plug replacement. Also, you may get into trouble after hitting the road for a certain time.
  • Defective or improper installation can cause issues with engine functionality. Distorted specs can initiate obstructions towards spark growth. Even the disturbance of other included parts during installation can take place.
  • The very first thing is plug specs to take into account. You better avoid the setup/replacement by yourself. Spending some more bucks will get you professional service. Don’t forget to check the replacement quality.

Frequently Asked Questions (FAQs)

Q: Can bad spark plugs cause transmission problems?

Answer: Modern car parts remain interconnected to each other to a certain extent. And bad spark plugs to mess with the engine mechanism. It indirectly affects the transmission problem throughout the entire vehicle.

Q: Are NGK spark plugs good for Chevy?

Answer: NGK is one reliable name when it comes to spark plugs. Likewise, it developed several models to fit into Chevy systems. Therefore, you can definitely count on specified NGK plugs for Chevy.

Q: What’s the distance for Chevy 6.0 spark plug gap?

Answer: The gap requirement varies from model to model. As it happens, most Chevy 6.0 settle for 0.030” or 0.040” gapping. Meanwhile, the latest versions require further precision with a 0.037” or 0.043” gap.

Q: Where are AC Delco spark plugs made?

Answer: All the available spark plug models of AC Delco features a Chinese origin.

Q: What’s the standard Chevy 6.0 engine gas mileage?

Answer: The limit isn’t exactly anything strict with lots of variations. Chevy 6.0L engines call for 12 to 16 mpg (Miles Per Gallon), depending on the model. Likewise, gas mileage remains slightly lower on city drive in comparison to the highway.

Q: What’s the required Chevy 6.0 spark plug thread size?

Answer: Thread size for any common Chevy 6.0L engine measures 14mm x 1.25mm. Though the specification can change, you’re to find the right thread easily.

Final Words

It’s not easy to exterminate all the cheap aftermarket replacements from your checklist. But you can save the trouble with our aforementioned review. Just know the demands & keep matching to have your best spark plugs for 6.0 Chevy.

As it happens, NGK 5464 BKR5EIX-11 IX Spark Plug has to take the first prize. The high-quality OEM replacement part covers every basic spec. The engine ignition system receives a new life to hit the road. And the price remains within an affordable reach.

Happy Driving.

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