5 Best Spark Plugs for Big Block 454 Engine

When it comes to getting the most out of your big block 454 engine, having the right spark plugs can make all the difference. 

The right spark plugs can boost performance, increase fuel efficiency, and even extend the life of your engine. But with so many options on the market, it can be hard to know where to start. 

This is why we’ve done the research for you and compiled a list of the best spark plugs for big block 454 engines. 

Whether you’re a seasoned mechanic or a weekend warrior, this guide will help you choose the perfect spark plugs for your engine and take your ride to the next level. So, let’s get started with it.

Best Spark Plugs for Big Block 454- Our Top 5 Picks

The Big Block 454 engine is a powerful and reliable engine for any vehicle, whether it be a truck, car, SUV, or van. But to make sure that engine runs at its peak performance, it needs to have the right spark plugs.

The right spark plugs will ensure that the engine is running at its most efficient and will also help to extend the life of the engine. So, what are the best spark plugs for a Big Block 454?

Here are our top 5 picks for you. Check out this list and pick the right one for you.

1. NGK Iridium IX Spark Plug YR5IX 

If you’re looking for the perfect spark plug upgrade for your CHEVROLET, there’s nothing better than the NGK Iridium IX Spark Plug YR5IX. 

This 8 pack of spark plugs is the ultimate choice for anyone who wants to improve the performance of their engine and achieve smoother acceleration.

The NGK Iridium IX Spark Plug YR5IX boasts an ultra-fine 0.6mm iridium center electrode that delivers superior ignitability and a longer lifespan. It also has tapered cut ground electrodes that reduce quenching for better combustion and improved fuel efficiency.

It is designed to fit perfectly with CHEVROLET engines and provide a consistent, stable spark. It is easy to install, and once you do, you’ll immediately feel the difference in your vehicle’s performance.

The high-quality construction and precise fit ensure reliable performance, while the iridium center electrode delivers a more efficient burn for better fuel economy. Whether you’re a performance enthusiast or just looking to get the most out of your CHEVROLET, these spark plugs are a great choice.

What We Like

  • Designed to last up to 4x longer than traditional spark plugs.
  • Provides superior ignitability and a more complete combustion.
  • Improved combustion process helps to reduce emissions.
  • Highly durable and long-lasting.

 What We Dislike

  •  These spark plugs are not compatible with some vehicles.

2. ACDelco CR43TS 5614029 (05614029) Professional

The ACDelco CR43TS 5614029 (05614029) Professional spark plug is an excellent choice for anyone looking to upgrade their vehicle’s performance. 

It is designed to deliver superior performance, efficiency and reliability. This spark plug is made from high quality materials and is engineered for long lasting performance. It also features an improved design, which makes it easier to install and maintain.

The patented ribs on the plug’s ground electrodes also help to maintain high performance. It also features a strong nickel alloy center wire and brass housing. This feature ensures that the plug lasts longer than traditional spark plugs. The spark gap is preset, so there’s no need for complex adjustments to get your plugs running correctly.

If you’re looking for a dependable spark plug that will last, then the ACDelco CR43TS 5614029 is definitely one worth considering. Not only will it ensure greater efficiency, but it will also save you time and money in the long run due to its durability and hassle-free maintenance.

What We Like

  • High-quality construction that stands up to wear and tear
  • Excellent spark plug for high-performance engines
  • Promotes smooth idle and reduced misfires
  • Provides better fuel economy

What We Dislike

  • May require a special spark plug gap tool to adjust the gap

3. NGK Standard Series Spark Plug YR5 (8 Pack) 

The NGK Standard Series Spark Plug is a great choice for those who want a reliable spark plug for their 454 Chevy big block engine. 

This spark plug offers the perfect combination of performance and value. It has a standard 0.040″ gap, which is exactly the same as the original equipment from the factory. This allows it to fit into literally any Big Block 454 engine without any fuss or modifications.

It delivers excellent ignition and firing, plus torque and acceleration that’s on par with the original equipment. Combustion is clean and efficient, so you can be sure that you’re getting top-notch fuel efficiency too. 

Its nickel-plated shell prevents corrosion even in moist or salty climates so no matter where you live. This spark plug will keep running reliably for longer than most other spark plugs on the market.

What We Like

  • Engineered for superior performance, the NGK Standard Series Spark Plug YR5 provides a reliable spark, improved fuel efficiency, and reduced emissions.
  • Has a corrosion-resistant nickel-plated shell and a heavy-duty triple-seal construction to prevent leakage.
  • It features a factory-set gap, making it easy to install and maintain.
  • Provides long-term reliability.

What We Dislike

  • It is relatively expensive compared to other brands.

4. AC Delco R45TS Conventional Spark Plug

When it comes to performance, the AC Delco R45TS Conventional Spark Plug is an excellent choice for any Big Block 454 engine. 

This plug features a standard 0.6 mm gap size and a cold heat range at 45, plus a resistor on its tip which reduces electronic interference. In fact, it’s designed to ensure that your engine runs smoothly and lasts longer.

Its triple-seal construction also makes sure that dirt, debris or oil doesn’t sleep in while being used, resulting in better performance. And because of its design, it offers extended service life with fewer required changes.

You don’t have to worry about corrosion either; it has superior corrosion resistance which ensures the spark plug can withstand long-term use in any kind of environment.

Overall, this AC Delco R45TS Conventional Spark Plug should definitely be on your shortlist if you’re looking for high performance spark plugs and wires. It provides strong sparks for reliable engine performance with minimal maintenance required.

What We Like

  • High quality construction and materials used
  • Long lasting and durable
  • Copper core electrode provides better conductivity and improved spark
  • Non-resistor design eliminates interference with electronic ignition systems

What We Dislike

  • May require more frequent replacement than other spark plugs

5. AC Delco R44T Conventional Spark Plug

The last item on our list is the AC Delco R44T Conventional Spark Plug. We pick it for lots of good reasons. 

This spark plug delivers superior performance for its sterling reputation in automotive circles, with a reliable spark to ignite your engine.

It is designed to increase fuel economy, reduce harmful emissions, and provide better acceleration by improving the power of your engine. You can trust AC Delco to provide products that are reliable, long-lasting and cost-effective.

The plug has a 14mm thread size and it features a 3/4 inch reach spark plug with a projected tip. It also includes an electrode that has been laser-welded onto the center electrode of the spark plug to provide added strength and improved heat transfer for longer performance life.

Its copper core center electrode increases conductivity and heat range for quicker starts and enhanced overall performance. 

The shell is made from durable steel and coated in a special platinum alloy for excellent corrosion resistance and improved service life.

It can be an excellent choice for big block 454 engines due to its reliable performance, durability, and cost-effectiveness.

What We Like

  • High quality construction ensures long-lasting performance
  • Provides reliable and efficient ignition
  • Resistant to corrosion and oxidation
  • Provides high-performance and efficient fuel economy

What We Dislike

  • Can be difficult to remove once in place
  • May require frequent replacement in some vehicles

How to Choose Best Spark Plugs for Big block 454

When it comes to choosing spark plugs for a big block 454 engine, there are a few key factors that you need to consider. The type of spark plugs you choose will affect the performance of your engine, so it’s important to choose the right ones for your application. 

Here are a few tips for choosing the best spark plugs for 454 Chevy. Check out these tips and follow accordingly while picking the right spark plugs for your big block 454 engine.

Type of Spark Plug

Copper spark plugs are the most basic type of spark plug, and they are usually the most affordable. However, they have a shorter lifespan compared to platinum and iridium spark plugs. Copper spark plugs are best suited for older engines that do not have modern ignition systems.

Platinum spark plugs are more durable than copper spark plugs and can last up to 100,000 miles. They also conduct electricity better and are more resistant to wear and tear. Platinum spark plugs are best suited for newer engines that have electronic ignition systems.

Iridium spark plugs are the most expensive type of spark plug, but they are also the most durable. They can last up to 120,000 miles and can withstand high temperatures and pressures. Iridium spark plugs are best suited for high-performance engines that generate a lot of heat and pressure.

Heat Range

The heat range of a spark plug is the measure of the plug’s ability to dissipate heat. It is essential to choose a spark plug with the correct heat range for your big block 454 engine.

If you choose a spark plug with a heat range that is too low, the spark plug will overheat, which can cause pre-ignition and engine damage. If you choose a spark plug with a heat range that is too high, the spark plug will not reach the optimal temperature, which can cause fouling and misfires.

Thread Size

Thread size of the spark plug is another essential factor to consider when choosing the best spark plug for your big block 454 engine. The thread size of the spark plug should match the size of the spark plug hole in your engine’s cylinder head.

If you choose a spark plug with the wrong thread size, the spark plug may not fit correctly, which can cause cross-threading, damage to the threads, and even engine damage.


It is also an essential factor to consider when choosing the best spark plug for your big block 454 engine. There are several reputable spark plug brands to choose from, including NGK, Bosch, Denso, and Champion.

Spark plug is best to choose a spark plug brand that has a good reputation and has been in the market for a long time. These brands have a proven track record of producing high-quality spark plugs that can withstand the rigors of the road.

Gap Size

The gap size of the spark plug is the distance between the center and ground electrodes. The gap size is critical because it affects the size of the spark that the plug generates.

It is essential to choose a spark plug with the correct gap size for your big block 454 engine. If the gap size is too small, the spark may not be strong enough to ignite the fuel and air mixture, which can cause misfires and engine damage. If the gap size is too large, the spark may not jump the gap, which can also cause misfires and engine damage.

Frequently Asked Questions

What Brand of spark plugs does Chevy use?

Chevrolet typically recommends using ACDELCO GM OE IRIDIUM spark plugs for most models.

What spark plugs does a 454 use?

The spark plug used in a 454 engine depends on the year and model of the vehicle. Generally speaking, spark plugs for 454 engines range from 14mm to 18mm in size, and have a heat range from 4 to 12. Popular spark plug brands for 454 engines include ACDelco, Autolite, Bosch, Champion, and NGK.

Do high performance spark plug wires make a difference?

Yes, high performance spark plug wires can make a difference in the performance of an engine. Spark plug wires are responsible for delivering the spark from the ignition coil to the spark plugs. 

If the spark plug wires are of low quality or the resistance of the wires is too high, the voltage may not be efficiently delivered to the spark plugs, resulting in a decrease in engine performance. High performance spark plug wires are designed to provide lower resistance.

What kind of spark plugs increase horsepower?

The type of spark plugs that increase horsepower depends on the make and model of your vehicle. Generally, performance spark plugs with a colder heat range will increase horsepower. Copper spark plugs help to increase combustion efficiency, which in turn increases horsepower. It is important to make sure that the spark plugs you choose are compatible with your vehicle’s engine and ignition system.

Does iridium spark plugs increase HP?

Yes, iridium spark plugs can increase Horsepower (HP). They are designed to burn fuel more efficiently than standard spark plugs, resulting in an increase in horsepower. Also, iridium spark plugs generate a stronger spark, which is more likely to ignite the fuel-air mixture in the combustion chamber, leading to more power.

What is the problem with iridium spark plugs?

Iridium spark plugs can sometimes be harder to find and more expensive than other types of spark plugs. The plugs also require more frequent replacement than other types of spark plugs, which can be an added expense and inconvenience.

Final Thought

What are the best spark plugs for your big block 454, depends on your individual needs. Consider each of these top-rated spark plugs, comparing their features carefully to determine which one is right for you. 

If you still can’t decide, consult with a knowledgeable professional for tips on finding the perfect spark plug for your engine. Make sure to check all spark plugs regularly, and replace them if needed, in order to keep your engine running in top form. Thank you all.


Leave a Reply