Did you know that spark plugs are among the most important parts of a vehicle? A faulty spark plug can give you power troubles and lower the efficiency of your engine. What’s more, it will also cause damage to the cylinder if you continue using it.
If it is time to get rid of your old spark plugs and buy new ones, you have come to the right place. We have compiled a detailed, comparative list for you. We have also added personal comments wherever necessary to make the shopping experience quicker and easier.
But, before we go any further, we would like to discuss a very important point –
How many spark plugs does a 5.7 Hemi have?
We are speaking about this because confusion has ensued multiple times in this regard. Typically, there are 2 spark plugs per cylinder. So, you must check how many cylinders your 5.7 Hemi has.
The answer is 8 cylinders.
This means that the total number of spark plugs is 16.
Often, people assume that the number of cylinders and the number of spark plugs is the same. But it is double!
Also, you must know that all the spark plugs are coil-on systems (except 2004 and 2005 models). This detail will help you choose the right one before going ahead.
5.7 Hemi spark plug gap
While we are at it, let’s answer another question – what’s the gap we must look at? Well, typically it is 0.43”. The right answer depends on the model.
So, before you choose a spark plug, make sure you check the fitment. Otherwise, you may end up damaging the cylinder by forcing the wrong spark plug.
Best spark plug for 5.7 Hemi
Now that we have answered the most common questions, let’s jump right in and discover the top spark plugs for 5.7 Hemi today.
1. Champion RE14MCC4 – Copper Replacement Plug
Champion is one of those few brands that live up to their name and impress with every product. These spark plugs are available in packs of 1, which means you can buy how many ever you need without investing in extras. But why should you buy them? Answers are below:
- The electrode has a copper core, giving you more control and increasing the life of the plug. It also controls the heat range very well.
- It also has a patented Ultra-seal coated shell that prevents corrosion wonderfully.
- The spark plug comes with the outstanding feature of EMI and EFI suppression thanks to its patented SAC-9 resistor (semi-conductor).
- They are known to be durable.
- They help improve the overall performance of the vehicle as they have been built to SAE and ISO standards.
- Value for money
- Must be gapped individually at 0.45” – do not come pre-gapped
2. Chrysler Jeep Dodge Ram 5.7 Hemi – Mopar Spark Plugs (pack of 16)
If you are changing all your spark plugs in one go and want to remove the hassle of buying 16 plugs separately, you should go with these. They are a pack of 16 and come with many attractive features such as the following:
- This is a nickel spark plug made with the factory standards as a template.
- Since they are stock-created, you can be sure that they will fit your vehicle without any problems.
- The spark plugs come with an anti-seizing coating so that you don’t have any issues while riding.
- You can easily keep track of the warranty on these spark plugs because they come as a pack.
- Safest bet because they come with factory settings
- Do justice to their price tag
- They don’t offer any performance improvement
3. NGK Standard Iridium Plugs – Pack of 16
If you have ever bought spark plugs before or if you know about automobiles, you will surely know about NGK. It is by far our favorite brand when it comes to spark plugs due to the following reasons:
- The 0.6 mm electrode has an iridium center that improves acceleration and ignitability. This is possible because the iridium core electrode increases the spark energy.
- The iridium alloy is at least 8 times stronger than platinum. It is also 6 times harder. This ensures better performance than any other conventional spark plug.
- These spark plugs can also handle an increase in temperature without any problems.
- If you are looking to upgrade your ride, these are the spark plugs you should buy. You will see an obvious improvement in durability and performance.
- All spark plugs have trivalent metal plating. This helps against corrosion and seizing.
- They have a long insulator nose that eliminates the trouble of contamination.
- Iridium build
- Removes electrical quenching
- Improved performance
4. NGK – SFR5F – Spark Plug (pack of 1)
If you are not looking at changing all 16 spark plugs and only want a few or just one, NGK has an Amazon’s Choice product to offer to you. Why is it so popular, you ask? We have listed the reasons out for you:
- These spark plugs have a nickel electrode with a copper body.
- The insulator is made of alumina silicate ceramic.
- It has a unique V-power center with a 45-degree angle that works to improve performance and reduce fouling.
- When compared to conventional plugs, you will see a significant improvement in performance and ignitability.
- The spark plug also requires less voltage than usual.
- It is anti-corrosive and anti-seizing thanks to its trivalent metal plating.
- High spark power
- Cools quickly
- V-cut in the center electrode provides better performance
- Copper body may not be the best choice
5. Autolite Double Platinum Spark Plug
If you are looking for a platinum spark plug, stop right here and take a look at what Autolite has to offer! It is designed to deliver high performance along with many other benefits thanks to the following features:
- They have platinum tips to ensure that there’s absolutely no gap erosion.
- They have been designed to deliver better performance and improve fuel efficiency.
- The center electrode is necked-down, thanks to which the plug fires clean and quick.
- It requires less voltage to jump into action.
- The side electrode is made of nickel alloy to ensure that the gap is maintained throughout.
- Its longevity is right up there with the best in its league.
- 5-year guarantee
- Wear out a little faster than the others
You have probably already noticed that even though they are considered as the best spark plugs for 5.7 Hemi, all the options above have specific and different features. This gives you the flexibility to choose based on your preferences and performance expectations. Make sure you do your homework and pick the best!
IMPORTANT – Before we sign off, we would like to speak about the frequency at which you should replace spark plugs. More often than not, people only do it when the spark plugs fail but we recommend a change every 6,000-9,000 miles. The longevity of a spark plug depends on the type of center electrode right from 75,000 miles for an iridium electrode and just 15,000 for copper alloy. However, it is mostly impossible to reach these numbers. The reason is that many factors such as fuel, engine, and weather conditions come into play. Getting them checked often is the best way to go.
If you have any doubts or concerns, please feel free to talk to us. We are always happy to help!