Best Spark Plugs for 6.4 Hemi Charger

When I first started digging into maintenance for my 6.4 Hemi Charger, I realized just how crucial the right spark plugs are. This isn’t just a standard four-cylinder; the 392 needs specific, high-quality plugs to maintain that powerful punch and keep the dual-plug system running optimally. Finding the best spark plugs for 6.4 Hemi Charger involves balancing sustained performance with long replacement intervals. I’ve gone through and reviewed the top options to help you choose wisely and keep that powerful SRT engine purring.

IMAGE	PRODUCT NAME	AMAZON LINK
	CHARGER CHALLENGER GRAND CHEROKEE 300 SRT8 6.4L HEMI SPARK…	View on Amazon
	NGK Laser Platinum Spark Plugs Compatible with Chrysler…	View on Amazon
	Autowxjq Iridium Spark Plug 16pcs Replace Chrysler Dodge…	View on Amazon
	16 pc Champion Platinum Spark Plugs compatible with Dodge…	View on Amazon
	16 pc NGK Iridium IX Spark Plugs compatible with Ram…	View on Amazon
	NGK Set of 16 Iridium IX Spark Plugs For Chrysler…	View on Amazon
	VIPCAR 8+16 Ignition Coil Pack and Iridium Spark Plugs…	View on Amazon
	NGK Laser Platinum Spark Plug LZTR6AP11EG (8 Pack)…	View on Amazon
	AULINK Set of 8 UF504 Ignition Coil Pack & LZFR5CI-11…	View on Amazon
	Ignition Coil Pack Spark Plugs fit for 5.7 Hemi Dodge…	View on Amazon

CHARGER CHALLENGER GRAND CHEROKEE 300 SRT8 6.4L HEMI SPARK PLUGS PLUG MOPAR OEM

If you prioritize keeping your 6.4L Hemi completely stock, going with the original Mopar OEM plugs is the safest bet. These are the exact plugs installed at the factory, ensuring perfect compatibility and meeting the stringent demands of the high-compression SRT engine. They deliver the consistent, reliable spark needed for the dual-plug setup, maintaining your Charger’s warranty and original performance specs.

Key features that stand out:
– OEM Match: Guaranteed perfect fitment and performance, just like the factory plugs.
– Reliable Performance: Engineered specifically for the high demands of the 6.4L SRT Hemi engine.
– Sold in Complete Sets: Often sold in the required quantity of 16 plugs for a full service.

• Pros: Maintains OEM standard, exceptional reliability, perfect fitment guaranteed.
• Cons: They can be pricier than equivalent aftermarket options.
• Best for: Enthusiasts who strictly adhere to factory specifications and maintenance schedules.

Expert Opinion: Sticking to Mopar OEM plugs is crucial for owners concerned about warranty or those running street cars without significant modifications. These provide the benchmark for expected longevity.

NGK Laser Platinum Spark Plugs Compatible with Chrysler Dodge Jeep 6.4L Hemi V8 with Twin Spark Ignition System (16 Pack)

NGK is often the manufacturer behind the Mopar OEM plugs, making this set a high-performance replacement that meets or exceeds factory standards. The Laser Platinum design features dual platinum contacts, significantly reducing gap erosion and ensuring excellent durability over the long haul. Since the 6.4L Hemi uses 16 plugs, this 16-pack is specifically designed to handle the entire replacement process efficiently.

Key features that stand out:
– OEM Manufacturer: NGK is frequently the OE supplier, guaranteeing quality.
– Dual Platinum Contacts: Offers superior wear resistance and extended plug life, often up to 96,000 miles.
– Twin Spark System Ready: Specifically packaged for the Hemi’s 16-plug configuration.

• Pros: Excellent longevity, extremely reliable performance, OE quality without the full Mopar price tag.
• Cons: Platinum plugs generally aren’t recommended for heavily modified engines.
• Best for: Owners seeking maximum longevity and OEM-level reliability for daily driving.

Expert Opinion: Given NGK’s role as an OEM supplier, these Laser Platinums are often the go-to choice for maintenance, offering massive mileage potential while maintaining factory smoothness.

Autowxjq Iridium Spark Plug 16pcs Replace Chrysler Dodge Jeep Ram 4.7L 5.7L 6.4L V8

This Autowxjq set offers a full replacement of 16 Iridium plugs, designed to withstand the extreme heat and electrical stress of modern high-performance Hemi engines. The iridium tip has an incredibly high melting point, translating directly into enhanced durability and a robust, stable spark. These come pre-gapped, potentially simplifying the installation process for the DIY mechanic.

Key features that stand out:
– Iridium Design: Extremely high melting point for maximum durability in high-performance situations.
– Pre-gapped: Ready for direct installation right out of the box, saving time.
– High Heat Resistance: Built to handle the specific demands of the 6.4L V8.

• Pros: Durable Iridium construction, convenient pre-gapping, strong value for a 16-pack set.
• Cons: This brand may lack the widespread recognition and testing history of NGK or Champion.
• Best for: Budget-conscious buyers looking for the durability benefits of iridium technology.

Expert Opinion: While not a household name, the specifications suggest a capable iridium plug. Always double-check the gap upon arrival, even if advertised as “pre-gapped,” especially in a performance engine like the 6.4 Hemi.

16 pc Champion Platinum Spark Plugs compatible with Dodge Charger 6.1L 6.4L V8 2006-2019

Champion is another brand with a rich racing heritage, providing reliable platinum spark plugs for the twin-spark 6.4L Hemi engine. This 16-pack focuses on long-lasting, powerful performance and emphasizes durable precious metals to improve performance while minimizing wear and tear. Champion designs their plugs to adhere to tough industry standards, guaranteeing a seamless OE-quality replacement.

Key features that stand out:
– Racing Pedigree: Champion’s history in motorsport translates to reliable ignition components.
– Durable Precious Metals: Platinum construction ensures long life and stable spark output.
– OE-Quality Replacement: Adheres to strict standards for proper fit and function in the Charger.

• Pros: Strong brand trust, good balance of performance and longevity, proven design.
• Cons: May offer slightly less longevity compared to NGK Laser Platinum models.
• Best for: Drivers who appreciate a brand with a legacy and want solid platinum performance.

Expert Opinion: Champion is a reliable legacy brand. Their Platinum plugs are a direct, reliable replacement option that will easily meet the factory recommended service interval for most Charger owners.

16 pc NGK Iridium IX Spark Plugs compatible with Ram 2500 5.7L 6.4L V8 2011-2020

While this listing targets the Ram 2500, the 6.4L engine requirements are often identical across the Dodge/Ram Hemi platform, making these Iridium IX plugs a top choice for performance-oriented Charger owners. The Iridium IX line is known for its extreme ignitability, providing improved throttle response and stable idle compared to standard platinum plugs. This 16-pack ensures you have every plug needed for the full service.

Key features that stand out:
– Iridium IX Technology: Designed for superior ignitability and enhanced performance feel.
– Direct Replacement Quality: Genuine NGK parts, guaranteeing fit and function.
– Performance Focused: Better suited for spirited driving compared to standard longevity plugs.

• Pros: Improved throttle response, high durability iridium tip, reliable NGK quality.
• Cons: Iridium IX plugs typically have a shorter service life expectation than Laser Platinum plugs.
• Best for: Enthusiasts prioritizing sharp throttle response and maximum performance feel.

Expert Opinion: The Iridium IX is an excellent upgrade for those who want a performance edge. While the replacement interval might be slightly shorter, the enhanced spark efficiency is noticeable, especially at higher RPMs.

NGK Set of 16 Iridium IX Spark Plugs For Chrysler Dodge Jeep Ram 5.7 6.4 V8

This is another dedicated 16-plug set of NGK Iridium IX plugs, confirming their suitability for the 6.4L Hemi architecture. Choosing NGK Iridium ensures the spark remains highly concentrated, minimizing misfires under load and providing a smooth power band. This comprehensive set makes a complete plug change straightforward, providing the benefit of iridium durability and performance.

Key features that stand out:
– Full Set: Contains all 16 plugs required for a complete 6.4 Hemi service.
– Iridium Construction: Provides high durability and consistent spark stability.
– Hemi Compatibility: Specifically cross-referenced for 5.7L and 6.4L V8 applications.

• Pros: Reliable performance upgrade, high resistance to fouling and wear, trusted brand quality.
• Cons: You must verify the correct gap before installing, as they might not be specifically pre-gapped for your exact model variation.
• Best for: Owners seeking NGK reliability with the proven benefits of high-performance iridium.

Expert Opinion: The Iridium IX line offers significant gains in ignitability over standard plugs. For a high-compression, dual-plug engine like the 392, ensuring the most powerful and consistent spark possible is key to efficiency and power.

VIPCAR 8+16 Ignition Coil Pack and Iridium Spark Plugs Set Compatible with Dodge 2008-2020 Ram Pickup 5.7/6.4L, Charger Challenger, for Chrysler 2009-2020 300 5.7/6.1L Aspen, 2008-2019 Grand Cherokee

For the truly comprehensive maintenance job, this VIPCAR set provides both 8 ignition coil packs and the 16 necessary Iridium spark plugs. Since the 6.4 Hemi is an incredibly demanding engine, replacing the coils at the same time as the plugs ensures the entire ignition system is fresh, preventing potential misfires caused by aging components. The coils feature high heat-resistant compounds, designed to prevent thermal cycling failure.

Key features that stand out:
– Complete Ignition Overhaul: Includes both 8 coils and 16 iridium plugs.
– Iridium Spark Plugs: Ensures high durability and a consistently stable spark.
– High-Quality Coils: Designed with higher-grade copper wires for improved heat resistance and durability.

• Pros: Excellent value for a full system replacement, maximizes ignition efficiency, one-year warranty on coils.
• Cons: Quality control on aftermarket coil packs can sometimes be inconsistent compared to OEM.
• Best for: Drivers tackling high-mileage maintenance or troubleshooting persistent engine misfires.

Expert Opinion: If your Charger is past the 100,000-mile mark, replacing the coils and plugs together is sound preventive maintenance. While the focus here is the Iridium plug quality, the coil pack inclusion offers substantial system reliability.

NGK Laser Platinum Spark Plug LZTR6AP11EG (8 Pack) Compatible With DODGE CHARGER R/T SCAT PACK 2015-2015 6.4L/392

This specific 8-pack is clearly labeled for the 6.4L/392 Hemi engine and utilizes NGK’s reliable Laser Platinum technology. Because the Hemi requires 16 plugs, you would need to purchase two of these 8-packs for a full service. The benefit of this specific part number is its precision laser-welded platinum center electrode, which ensures maximum precision and long-term durability, confirming it’s an OEM-approved choice.

Key features that stand out:
– Precision Engineered: Features a laser-welded platinum center electrode for accuracy.
– Dual Platinum Contacts: Maximizes durability and ensures long plug life.
– OE Approved: Reliable choice meeting original equipment manufacturer standards.

• Pros: Highly specific fitment confirmation for the 392 Hemi, extremely high quality and durability.
• Cons: Requires purchasing two packages to complete the 16-plug service.
• Best for: Owners who prefer buying highly specific, dedicated NGK parts for their Scat Pack or SRT.

Expert Opinion: When an NGK product has this level of specificity (LZTR6AP11EG), you know it’s engineered precisely for the application. This is arguably the highest quality platinum plug available for maximizing lifespan in the 6.4 Hemi.

AULINK Set of 8 UF504 Ignition Coil Pack & LZFR5CI-11 Spark Plugs (5.7L 6.1L 6.4L) For Dodge Challenger 2008-2016,Charger 2008-2015,Durango 2006-2009,for Jeep Commander Grand Cherokee

Similar to the VIPCAR option, AULINK provides a combo pack of 8 ignition coils and 16 spark plugs (the LZFR5CI-11 model). This set is designed for a variety of Hemi engines, including the 6.4L Charger. By offering the coil packs along with the plugs, this set provides a cost-effective way to address potential ignition system weakness, using trivalent metal plated spark plugs for superior conductivity and corrosion resistance.

Key features that stand out:
– Combo Package: Includes 8 coil packs and 16 plugs for a complete ignition system renewal.
– Trivalent Metal Plating: Provides anti-seizing and superior corrosion protection on the plug threads.
– Strict Quality Control: Manufactured in certified facilities to ensure reliability.

• Pros: Excellent value for a complete ignition system refresh, anti-corrosion plating is beneficial, strong fitment listed across Hemi generations.
• Cons: Warranty coverage is limited to 1 year or 50,000 km.
• Best for: Value-driven maintenance when both coils and plugs are due for replacement.

Expert Opinion: Combo kits like this offer incredible peace of mind. While the plugs themselves are key, don’t overlook the stress the coils endure in the 6.4L engine bay. Replacing them simultaneously prevents future headaches.

Ignition Coil Pack Spark Plugs fit for 5.7 Hemi Dodge Ram 1500, Chrysler 300, Challenger Charger Durango, Jeep Commander Grand Cherokee, 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020

This final combo set emphasizes system synergy, stating that replacing coils and plugs together achieves a “better and smoother ignition system.” This set focuses on solving common Hemi ignition issues like misfires, rough idle, and poor fuel economy by ensuring all components are fresh. Note that this set generally targets the 5.7L Hemi but lists compatibility with the Charger/Challenger platform where the 6.4L is present.

Key features that stand out:
– System Synergy Focus: Designed to be replaced together for maximum performance gain.
– Troubleshooting Solution: Specifically marketed to solve misfire and idle issues.
– Premium Materials: Built to meet or exceed OEM specifications.

• Pros: Addresses common Hemi issues comprehensively, includes all necessary components (8 coils, 16 plugs), great affordability.
• Cons: May require the buyer to confirm the exact plug part number included to ensure it matches the 6.4L specification rather than the 5.7L.
• Best for: Owners focused on restoring smoothness and resolving rough running conditions cheaply.

Expert Opinion: While these combo packs are excellent value, buyers must confirm the exact spark plug included is rated correctly for the higher compression ratio and heat range of the 6.4L engine, which is generally slightly different than the 5.7L requirements.

Comparison Insights: Choosing the Right Hemi Plug

When deciding between the excellent options available for your 6.4 Hemi Charger, you must consider the trade-off between longevity and performance.

For owners prioritizing the longest possible service interval—often hitting 90,000 to 100,000 miles—the NGK Laser Platinum models are typically the undisputed champions. The dual platinum design significantly limits electrode erosion, making them ideal for the stock maintenance schedule. The MOPAR OEM plugs also fall into this category, offering guaranteed factory performance.

However, if you prioritize instant throttle response, quicker ignition, and generally better performance feel, Iridium spark plugs are the way to go. Options like the NGK Iridium IX are designed with a finer tip that maximizes ignitability, leading to a crisper engine feel. Just be aware that Iridium IX plugs usually have a recommended replacement interval closer to 50,000–60,000 miles, making them a performance upgrade requiring more frequent replacement.

If your 6.4L Charger has high mileage (over 100k) or you are experiencing intermittent misfires, investing in a plug and coil combo pack offers the best insurance. Replacing the coils simultaneously ensures that the new, high-quality plugs are receiving the maximum necessary voltage, making combo packs like those offered by VIPCAR and AULINK fantastic value for system reliability.

Final Verdict

Making the right choice for your 6.4 Hemi Charger spark plugs depends entirely on your driving style and maintenance goals.

The Best Overall (Stock Longevity): For the vast majority of Scat Pack and SRT owners, the NGK Laser Platinum Spark Plugs (16 Pack) provide the highest quality, longest life, and confidence that comes from using an OE supplier, making them the most balanced choice.

The Best Performance Upgrade: If you are chasing every bit of responsiveness and are willing to service the plugs more frequently, the NGK Set of 16 Iridium IX Spark Plugs offers superior ignitability and performance gains.

The Best Value for High-Mileage Maintenance: If you need a complete overhaul of the ignition system, including coils, the VIPCAR 8+16 Ignition Coil Pack and Iridium Spark Plugs Set provides the most comprehensive solution at an attractive price point.

FAQs About Best Spark Plugs For 6.4 Hemi Charger

How many spark plugs does the 6.4 Hemi Charger require?

The 6.4L Hemi engine, also known as the 392, uses a dual-plug ignition system. This means that there are two spark plugs per cylinder. Since the engine is an eight-cylinder V8, you will need a total of 16 spark plugs for a complete replacement. Ensure any set you purchase for a full service contains 16 units.

What is the recommended replacement interval for 6.4 Hemi spark plugs?

The factory-recommended replacement interval for the original equipment (OEM) Mopar platinum spark plugs in the 6.4L Hemi is typically around 96,000 to 100,000 miles. If you opt for performance-focused Iridium IX plugs, the service life is generally shorter, often recommended closer to 50,000 to 60,000 miles to maintain peak performance.

Should I choose Platinum or Iridium spark plugs for my 392 Hemi?

It depends on your priority. Platinum plugs (like NGK Laser Platinum) are generally recommended for standard use because they offer maximum longevity and meet OEM mileage standards. Iridium plugs (like NGK Iridium IX) are better for high performance because their finer tip improves ignitability and provides a stronger, more consistent spark, which is beneficial in modified or aggressively driven vehicles.

Are pre-gapped spark plugs safe to install in my Hemi Charger?

While many aftermarket plugs are advertised as pre-gapped, it is always recommended to verify the gap setting using a proper gapping tool before installation in a performance engine like the 6.4L. The correct gap is crucial for optimal combustion and preventing misfires, and shipping vibrations can sometimes alter the pre-set gap.

When should I consider replacing the coil packs along with the spark plugs?

It’s wise to consider replacing the coil packs (ignition coils) if your 6.4L Charger has exceeded 100,000 miles, or if you are already experiencing symptoms like engine misfires, poor fuel economy, or a rough idle. Since the labor to replace the plugs and coils is similar, opting for a combo pack provides a cost-effective way to refresh the entire ignition system for maximum reliability.

Does the higher compression of the 6.4 Hemi require a specific heat range of spark plug?

Yes, the high compression and operating temperature of the 6.4 Hemi engine often require a colder heat range spark plug compared to the standard 5.7L Hemi. Always ensure the spark plug you select (whether OEM or aftermarket) is correctly rated for the 6.4L application to prevent pre-ignition and engine damage under heavy load.