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10 Best Spark Plugs For 5.7 Hemi – Reviewed + Buying Guide

The spark plugs play a significant role in igniting the gasoline within a combustion chamber by generating the spark required for ignition. However, that’s not its entire feature: it also transfers heat from the combustion chamber to the cooling system.

However, assuming your 5.7 Hemi has defective spark plugs, this is the right time to gift your four-wheeler buddy the best spark plug. We investigated and analyzed a variety of spark plugs for your 5.7 Hemi because you may be unfamiliar with the nuances of spark plugs or how to select the best one for your 5.7 Hemi.

The greatest spark plug, according to our research, is the Fram Autolite AP5263 Platinum Spark Plug. This article will teach you about the many options available based on your preferences and budget, as well as what to look for when selecting a spark plug to bring the roar back to your engines. We also recommend you check the best exhaust headers for chevy 350.

So, without further ado, let’s begin with the list.

10 Best Spark Plugs For 5.7 Hemi – Reviewed + Buying Guide

All the products mentioned here are available online on amazon.com.

1. Fram Autolite AP5263 Platinum Spark Plug

  • High nickel alloy side electrode
  • Full platinum tips
  • Great value for the price
  • Easy installation
  • Pre-gaped design is not recommended

When compared to competitors’ prices for a platinum spark plug, these are a great deal. The installation was as simple as any other spark plug installation. Remove the plastics, coil packs, and plug wires. 

Remove the spark plugs, apply anti-seize to the threads, install the spark plugs, snug them up 1/4 turn, add dielectric grease to the boots, and replace everything else. On a GMC Terrain, I’d guess it takes approximately 20 minutes. 

Autolite strongly advises you to reference your car’s instruction booklet for detailed notes on replacing the spark plugs. Engines vary greatly depending on the make and type. These instructions should only be used as broad guidelines.

I don’t rely on a pre-gapped connection that has been passed from warehouse to warehouse and eventually through a mail system. I got a lot of plugs, and even though my box of eight gaped at the proper setting, I did locate one with a bent tip despite the fact that there was no damage to the container. 

A gaping device can be purchased for a few dollars from your local vehicle parts store. I would not rely on a gaped factory configuration.

2. MAS Set of 8 Ignition Coils Motorcraft Spark Plugs

  • Great fit for any Hemi  
  • Extremely cheap price
  • Not very durable

I was having issues with power as if it was missing or slipping through the transmission. I used this kit to replace all of the plugs and coils, and the problem is no longer present. 

Excellent bargain; I would buy it again. It’s worth noting that the plugs in these engines have a habit of shattering when you try to remove them. According to the Ford mechanic I spoke with, I had one of eight breaks, which is really good. 

I got the Lisle 65700 Damaged Plug Remover Kit for Ford 3V Engine and utilized it without issue to remove the broken plug. I bought a magnetic 9/16″ spark plug socket with an extension meant for removing triton 3v plugs and installed them right away. It now runs flawlessly, with no errors or misfires. 

These are also actual 546 plugs, not 515 plugs!! These are one-piece plugs, not welded ones that are prone to falling off in the heads

3. ACDelco GM Original Equipment 41-993 Iridium Spark Plug

  • Great for a Vortec engine
  • Adds great ignition power to the engine
  • The iridium electrode is fragile

I looked for a long time for the right spark plugs for my 1997 Chevrolet Pickup 5.7L V8, and these were the best ones I could find. Essentially, the OE spark plugs that GM initially used in the engine, but with an iridium update. 

I could tell straight away that I had made the right choice after starting the truck and letting the engine idle. It’s never been more efficient. I recommend these for a GM 5.7L “Vortec” engine, which I believe was manufactured between 1994 and 1998. 

I replaced these plugs because I read that Vortec engines run better with these plugs, and despite the bigger spacing, my van runs so much smoother and seems to have more power. 

Please don’t leave any gaps between these plugs. They are pre-programmed from the factory and are not intended to be tampered with. The extremely small Iridium electrode is delicate and should be left alone. Send the boxes back for an exchange if they are damaged and the gaps appear to be closed.

4. Champion Copper Plus 71 Spark Plug

  • Excellent value 
  • Great fit for my vehicle
  • Components might be missing from the package

This is a popular plug for many small engines; however, make certain that you use the correct plug for your engine. I’m not sure what else to say about a spark plug in terms of review- it sparks when requested to. 

It arrived in perfect condition. As a long-time gearhead, my advice is to stay with recognized brand plugs. There are various unusual plugs on the market, but in a tiny engine, unique plugs are usually ineffective. 

This is also true for many automobiles, however, the results vary greatly in larger engines. Keep it simple- the good old Champion 12YC plug has been around for a long time and is the plug that many engines come with out of the box.

Excellent value and a great fit for my vehicle. This is the same plug indicated in the original handbook; easy off, easy on; just make sure to put a touch of clean oil or anti-seize to the threads to avoid future concerns and establish the gap according to the mower’s manual.

5. Champion Copper Plus 570 Spark Plug

  • Cheaper than most other products of the same category
  • Corrosion-resistant feature
  • Pre-gapped product, not recommended

These are used in my 300C with a 5.7 Hemi and two plugs per cylinder. I follow Chrysler’s recommendation of changing the plugs every 30k miles, so I don’t spend the extra money on the Platinum or any other sort of long-life plug. 

In addition, I’ve read about folks with the identical engine having problems with anything other than the standard copper plug. I only drive this car in the summer, therefore it will take me 2-3 years to reach 30k miles. 

I routinely change them before the 30k guideline because they are so simple to change, so I can’t answer to the longevity. I pay less than $30 for a plug change, compared to $60 to $100 or more for Platinum or Double Platinum plugs. 

I’m very sure I’d get nothing more from the “super” plugs than an empty wallet. In my opinion, if your vehicle’s manufacturer suggests a copper plug, you can’t go wrong with this product.

6. NGK 5464 Iridium IX Spark Plug

  • Price is affordable
  • Not pre-gapped
  • Iridium plug is not as efficient as platinum ones

My Hemi had been running rough and needed new spark plugs, so I decided to go for the upgrade and try iridium plugs. The previous plugs had roughly 50k miles on them and were far past their expiration date. 

The OEM plugs were platinum, and I’d heard that platinum plugs can last for up to 100k miles. That was not the case here, as they were all fouled after 50k. When I put on the new iridium plugs, my engine was like new again. 

The idle was smooth and quiet, just as it should be. I’ve also observed a minor improvement in fuel economy, which comes as no surprise after replacing fouled-out plugs.

I can’t say whether the BKR5EIX-11 Iridium IX Spark Plugs are any better than the OEM platinum plugs because I’ve only put about 1k miles on them, but they’re about the same price. 

Because iridium is a considerably harder metal than platinum and has a much higher melting point, these plugs are more durable and should last longer, at least in theory. They don’t run any hotter than OEM plugs. 

However, because they have a finer electrodes, they take less power to generate a spark, making them more efficient. I anticipated these to be pre-gapped, but because they weren’t the OEM plugs for my 5.7 Hemi, they were not pre-gapped.

7. Stens 130-806 NGK Spark Plug NGK

  • Will serve great for about 50k miles.
  • Perfect fit for a jeep
  • The build quality is not good

This is my second purchase of Spark plugs for my 2014 Jeep Compass 2.4L 6Speed Trans FWD. Amazing results from my last set, and after a month on this set, I’m still pleased with the plugs. 

Don’t forget to get the Dielectric Grease, Anti-Seize Lube, and the proper gap according to your research/owners handbook, as well as the torque for the spark plugs, which I determined to be 12 ft. lbs. 

On a 2014 Jeep Compass, I’m performing the suggested 50,000-mile service. The fit is perfect. While you’re here, don’t forget to replace the coils. They break down around these miles. As a result, this tune-up is recommended every 50k miles.

The spark plugs are delivered in a little cardboard box. Each spark plug is individually packaged to ensure that it is not damaged during transportation. After 3000km, I am extremely pleased with the product NGK 2262 spark plug. 

The engine purrs like a kitten once more. Previously, I had original GM spark plugs with severely worn-out electrodes. As a result, the car suffered ignition issues, which have now been resolved. These GM spark plugs were most likely in the engine for more than 60.000km, which is way too long.

8. ENA Set of 6 Iridium Spark Plug

  • Ceramic coating provides great insulation
  • The platinum body is the most durable
  • A bit expensive

Make my car look exactly like the original. They are simple to install, but you must remove the top of the motor to do so, which is not their fault; it is due to the way the car is built. 

To retrieve plugs, make sure you have a 14mm deep socket or a 14mm spark plug socket. Regular sizes will not fit. After adjusting the plugs and coils, the engine runs quite smoothly. It takes some time to install, but it is doable with patience.

Although the plugs require a 14mm spark plug socket, which is slightly more difficult to get in the US, they are a good buy. Installing coils is a little difficult due to the architecture of the 3.5 Nissan engine, but this is also Nissan’s problem, not the coil and plug makers. 

But so far, so good. I connected my obd2 scan tool and there are no misfires or engine codes as of yet, but I will update if they appear.

9. Bosch Automotive 9619 Double Iridium Spark Plug

  • Increased durability
  • Superior ignitability
  • Gaps are not recommended

Copper, platinum, and iridium all have their uses in technology, but the propensity to cause fowling, burn holes in cylinder heads, hesitancy, hot plugs, or bad performance seems a bit far-fetched to me. 

Unless you have a high-performance vehicle or strong hauling requirements, I don’t see these plugs failing you. If you have a high-performance vehicle, I’d expect you’d search elsewhere for information rather than my two cents and someone’s anecdotal proof.

I installed these in a ’07 Chrysler 300C, removed the original champion copper plugs with 45k on them, and everything seemed to work well except for the electrode being scorched down to.50 gaps. 

They were replaced solely on the basis of age and mileage. These new Bosch platinum plugs are pre-gapped at.44, but I remapped them to.42 on a blog tip, and they look to work great in the vehicle. 

Others who believe anything other than OEM is causing harm to their vehicle are mistaken, and they may have more problems with their vehicle than just a spark plug.

10. Mopar Chrysler Jeep Dodge Ram 5.7 Liter HEMI NKG Spark Plugs

  • Perfect fit for 5.7 EZH engine
  • Installation is very easy
  • Not very affordable and the value for the price is not satisfactory

These are the original Mopar spark plugs. They were a perfect match for my 2012 Ram 1500 5.7 EZH engine. You must check the gap. The plugs arrived gapped at 0.044, although my specifications call for 0.043. 

One of them was gapped at 0.050. If you’re putting in a Hemi, you’ll need the GearWrench 80546 5/8-Inch x 6-Inch Swivel tool. To get to the plugs directly beneath the brake booster and the two plugs behind it and up against the firewall. 

You’ll also need a separate 5/8 socket, a pair of short swivel extensions, and possibly a magnet. These can be difficult. You’ll have to insert each socket and extension one at a time because there won’t be enough room to do it all at once.

You’ll have to remove it in the same manner, and you may need to use the magnet to take out the socket and plug. The plugs arrived safely wrapped and cushioned. Permatex 81343 Anti-Seize Lubricant and Permatex 22058 Dielectric Tune-Up Grease were also utilized to complete the installation.

What to consider while buying a spark plug?- Buying Guide

1. Type of spark plug

Spark plugs come in primarily three kinds of metal bodies.

2. Copper spark plug

A copper spark plug is made from copper and is quite resistant to heat and temperature. They are also cheaper than their counterparts. For a copper spark plug Champion Copper Plus, a 71 Spark Plug is the best.

3. Iridium spark plugs

Iridium spark plugs are another type. They are the most common ones that are preferred by consumers due to their superior ignition quality and higher performance which they offer at an affordable price. ACDelco GM Original Equipment 41-993 Iridium Spark Plug are the best iridium spark plugs.

4. Platinum spark plugs

In terms of performance, heat resistance, and ignition quality platinum spark plugs are quite efficient, however, what makes them less favorable is their higher pricing. Fram Autolite AP5263 Platinum Spark Plug is by far the best platinum spark plug.

5. Size of the product

Spark plugs are available in a range of sizes starting from 10mm to around 18mm. But for a 5.7 Hemi 14-16mm spark plugs are the perfect fits. In terms of size Fram Autolite AP5263 Platinum Spark Plug are the best fit for a 5.7 Hemi.

6. Gap size

Spark plugs come for all kinds of vehicles ranging from diesel to gasoline engines. So, every spark plug is not meant for every engine, but if are going for one that is not specifically mentioned for its type then it is recommended not to go for pre-gapped factory versions. You can incorporate the gap as per your need. 

Generally, for a 5.7 Hemi, a Gap of 0.43 inches is perfect, and according to our analysis, the Mopar Chrysler Jeep Dodge Ram 5.7 Liter HEMI NKG Spark Plugs has the perfect size for it.

Our Verdict

The effectiveness of spark plugs has a significant impact on the overall engine performance. So, under any given conditions, you must not rethink using a spark plug and your decision. 

To provide you with the best and most effective spark plug in the market we have tried and tested numerous spark plug models on various cars and according to our analysis, we found the Fram Autolite AP5263 Platinum Spark Plug to be the best in overall performance. We also recommend you to check How To Clean Cold Air Intake Filter.

Frequently Asked Questions

In terms of melting point and ignition performance the iridium spark plug is the most efficient, however, with time the efficiency will decrease and you might want to replace them.

For any common iridium or platinum spark plug, about 100,000 miles is the most probable service life of the product.

A spark plug can run for 100000 miles at best, but it is recommended to change it after 50,000 miles for convenience and best performance.

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