The 5.7L Hemi uses sixteen spark plugs, so the right choice makes a real difference in throttle response and engine smoothness . NGK Iridium IX plugs deliver excellent ignitability with a fine-wire iridium tip, offering a great balance of performance and service life for most Charger owners .
For maximum longevity, NGK Laser Iridium plugs use both an iridium center electrode and platinum ground electrode, making them the top choice for those who want 100,000 miles between changes . Champion Iridium plugs provide reliable OE-quality performance with a stabilizing effect on ignition voltage.
For budget-conscious maintenance, Champion Copper Plus plugs offer excellent conductivity at a lower cost, though they need replacing every 30,000 miles . When replacing plugs on higher-mileage Hemi engines, many owners also choose to replace the ignition coils simultaneously to address rough idling or misfires . Each option balances durability, cost, and performance.
5 Best Spark Plugs For 5.7 Hemi Charger
| Image | Title | Best For | Link |
|---|---|---|---|
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NGK Iridium IX Spark Plugs Set | Premium performance and longevity for daily drivers. | View on Amazon |
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Champion Copper Plus Spark Plugs | Classic OEM-style performance for Charger owners. | View on Amazon |
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Champion Copper Plus Spark Plugs | Best budget option for 5.7L Hemi maintenance. | View on Amazon |
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TRQ Iridium Spark Plug Kit | Complete tune-up solution with iridium durability. | View on Amazon |
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Autoexact Ignition Coils and Plugs | All-in-one kit for replacing coils and plugs together. | View on Amazon |
Our Top 5 Best Spark Plugs For 5.7 Hemi Charger Reviews – Expert Tested & Recommended
1. NGK Iridium IX Spark Plugs Set of 16
The NGK Iridium IX set is a fantastic choice if you want to move beyond standard copper plugs. They offer improved throttle response and long-term durability, making them a perfect match for the 5.7L Hemi.
Key Features That Stand Out
- ✓ Iridium fine-wire center electrode for maximum firing power
- ✓ Trivalent metal plating for superior corrosion resistance
- ✓ Specifically designed for Mopar 5.7L and 6.4L engines
Why We Recommend It
We love these because they provide a noticeable upgrade in ignition consistency. They are highly reliable, ensuring your engine runs smooth over long periods without the frequent maintenance intervals required by cheaper alternatives.
Best For
Best for drivers who want a premium, high-performance spark plug that lasts longer than standard copper options.
Pros and Cons at a Glance
2. Champion Copper Plus Spark Plugs
If you prefer keeping your Charger running exactly as the factory intended, Champion Copper Plus is the way to go. These are widely considered the gold standard for original Hemi engine performance.
Key Features That Stand Out
- ✓ Proven OEM design specifically for 5.7L Hemi engines
- ✓ Superior resistance to corrosion and fouling
- ✓ Reliable spark delivery in all driving conditions
Why We Recommend It
These plugs are tried and true. Many Hemi owners stick with Champion Copper because they offer consistent performance at an excellent price point, keeping the engine running exactly as Chrysler intended.
Best For
Best for those who want to maintain the original factory specifications of their Dodge Charger.
Pros and Cons at a Glance
3. Champion Copper Plus Spark Plugs (Value Set)
If you are looking to save money while still using high-quality parts, this 16-pack is ideal. It provides the exact same performance as individual plugs but in a convenient, cost-effective bundle for your Hemi engine.
Key Features That Stand Out
- ✓ Full 16-plug set for a complete Hemi tune-up
- ✓ Consistent ignition performance
- ✓ Trusted, reliable manufacturing quality
Why We Recommend It
We recommend this bundle because it takes the guesswork out of buying parts for your Hemi. It is a no-frills, reliable solution for budget-conscious owners who want to get their engine running like new again.
Best For
Best for DIY enthusiasts looking for an affordable, complete spark plug replacement kit.
Pros and Cons at a Glance
4. TRQ Iridium Spark Plug Kit
This kit provides high-quality iridium performance in a comprehensive 16-piece set. It is designed to make your next tune-up straightforward, even if you are doing it in your own garage.
Key Features That Stand Out
- ✓ High-quality iridium material for extended life
- ✓ Complete 16-piece kit for V8 engines
- ✓ Designed for consistent ignition performance
Why We Recommend It
The durability of iridium makes this a great set-it-and-forget-it upgrade. TRQ provides a solid product that ensures your Hemi engine will have a strong, reliable spark for thousands of miles.
Best For
Best for those who want the longevity of iridium with the convenience of a full replacement kit.
Pros and Cons at a Glance
5. Autoexact Ignition Coils and Iridium Spark Plug Set
If you notice a rough idle or poor fuel economy, your ignition coils might be as worn as your spark plugs. This set covers everything, giving you a complete ignition overhaul in one box.
Key Features That Stand Out
- ✓ Combines 8 ignition coils with 16 iridium plugs
- ✓ Complete system renewal for better combustion
- ✓ Pre-gapped plugs for easier installation
Why We Recommend It
This is the ultimate convenience kit. Replacing the coils alongside your plugs is a smart proactive measure, and having them both in one set makes your maintenance task much more efficient.
Best For
Best for high-mileage Hemi engines showing symptoms of misfire or hesitation.
Pros and Cons at a Glance
Complete Buying Guide for 5.7 Hemi Charger Spark Plugs
Essential Factors We Consider
When choosing the right spark plugs, we look for durability, firing consistency, and compatibility with the Hemi’s dual-plug cylinder head design. Iridium is generally superior for longevity, while copper remains the reliable standard recommended by the factory.
Budget Planning
If you are on a tight budget, high-quality copper plugs are perfectly adequate. However, if you plan on keeping your Charger for many years, investing in iridium sets will save you money in the long run because they require far fewer replacements.
Final Thoughts
Maintaining your 5.7L Hemi is the best way to ensure it remains a beast on the road. Whether you choose the factory-spec Champion plugs or an upgraded iridium set, ensure you double-check your gap specifications and use a torque wrench for proper installation.
Frequently Asked Questions
Q: How often should I change spark plugs on a 5.7 Hemi?
A: The manual generally suggests replacing them every 100,000 miles, but for optimal performance and to prevent them from seizing in the heads, many enthusiasts change them every 30,000 to 50,000 miles.
Q: Why does the 5.7 Hemi have 16 spark plugs?
A: The Hemi engine uses a dual-ignition system to promote more complete fuel combustion, which helps increase power and improve emissions efficiency across the RPM range.
Q: Do I need to gap my spark plugs before installation?
A: While many modern plugs come pre-gapped, it is always a good practice to verify the gap against your engine manual before installing them to ensure proper performance.