Does your HEMI engine sometimes feel sluggish, like it’s not quite running at its best? That frustrating hesitation or slight misfire often points to one small but mighty part: the spark plug. For owners of the powerful 5.7L HEMI, choosing the correct spark plug isn’t just about keeping the engine running; it’s about unlocking that legendary power and efficiency.
The problem is, the market floods you with choices. Should you pick copper, iridium, or platinum? Picking the wrong one can hurt your fuel economy, reduce horsepower, and even damage expensive engine components over time. It’s a confusing choice that can leave any DIY mechanic scratching their head, wondering if they are spending money wisely or just buying the wrong part.
This guide cuts through the confusion. We will break down exactly what your 5.7L HEMI needs to fire perfectly every single time. By the end of this post, you will know the top-rated plugs, understand the technology behind them, and feel confident selecting the perfect set for your truck or car.
Top Spark Plug For 5.7 Hemi Recommendations
- Genuine NGK Parts
- REDUCE EMISSIONS AND MISFIRES: This tried-and-true Spark Plug boosts performance, and enables better performance so that your engine runs at its best; The durable shell reliably protects the spark plug from damage, ensuring long-lasting sparking capabilities; The center and ground electrodes promote sharper spark focus for fewer misfires
- IMPROVE IGNITION AND SPARK EFFICIENCY: This Spark Plug employs advanced center and ground electrodes to produce complete and efficient combustion and deliver an outstanding spark for faster, stronger, and more powerful combustion over the life of the spark plug; The damage-tolerant center and ground electrodes minimize spark gap growth and provide greater ignitability and spark efficiency
- TRUST IN NGK NTK: Explore components built by the world leader in the design of spark plugs and oxygen sensors; Their attention to performance excellence is what has differentiated them from the competition and allowed them to be the number one supplier of spark plugs and oxygen sensors
- Genuine Champion Parts
- RELY ON QUALITY SPARK PLUGS: Champion ignition parts keep engines running at their best; Their spark plug catalog provides a diverse set of spark plug types to meet modern engine demands for long-lasting, powerful performance; Built with durable precious metals, Champion Spark Plugs improve performance without the same wear and tear found in competitor plugs
- TRUST IN CHAMPION: Champion has powered more racing legends and won more races than any other spark plug brand; All that success at the track translates to more innovation and a more reliable spark plug for you; With years of expertise in engineering and manufacturing OE components for major automotive manufacturers, Champion understands the importance of a seamless OE-quality replacement part; Their spark plugs adhere to the toughest industry standards for a better fit and longer plug life
- This 16 pack NGK Iridium IX Spark Plug is compatible with Ram 1500 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011 5.7L V8
- Genuine NGK Parts
- Includes original packaging and hardware
- Direct replacement auto parts
- Confirm vehicle fitment with Amazon Confirmed Fit
- MANUFACTURER: Dragon Fire Performance
- UP TO 15% MORE ENERGY - OEM GRADE DURABILITY
- DIRECT FACTORY REPLACEMENT PART - PLUG AND PLAY
- COMPATIBLE WITH 2008-2019 Dodge Jeep Chrysler Ram 5.7 5.9 6.1 6.4 V8 Replaces 56029129AB UF504 LZFR5CI-11 92145 **Be Sure to Check for Correct Fitment Using the Chart Above. Don't See a Chart? Message us for help.
- 【Compatibility Information】：Spark Plug 4024123628 Compatible with Ram 1500 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 Big Horn Crew Cab Pickup 4-Door 5.7L V8 GAS OHV Naturally Aspirated.Please see images or details page for complete Compatibility information.
- 【Spark Plug Features】:BDFHYK Spark plugs with superior ignition performance, faster and more sensitive ignition jumps, significant increase in power performance, saving energy consumption in the ignition process, efficiently adapted to the needs of the car. Exquisite production process, 100% brand new high quality auto parts, OE level durability.
- 【Relive Performance】:OE standard performance and durability TS16949 certified manufacturer. All center electrodes are made from extremely fine iridium electrodes for good ignition performance. Insulators are made from isostatic ceramics for high density, strength, and good insulation.
- 【OE Part Numbers】:Spark Plug compatible to 4024123628.Please confirm the compatibility according to the year/make/model of your vehicle and the OE number of the replaceable part.
- 【About BDFHYK】A professional auto parts manufacturer with mature industry lines. We have our factory and experienced developer.We are committed to providing a 12-month quality service. If you have any questions,contact with us,we will reply you in 24 hours and offer the solve way for you.Choose BDFHYK,choose good service.
- Vehicle Fitment-1:Compatible with Ram: 2006-2010 Ram 1500 Truck V8 5.7L, 2006-2010 Ram 2500 Truck V8 5.7L, 2006-2009 Ram 3500 Truck V8 5.7L; Compatible with Dodge: 2011-2016 Challenger V8 5.7L, 2011-2016 Challenger V8 6.4L, 2008-2010 Challenger V8 6.1L, 2008-2015 Charger V8 5.7L, 2012-2014 Charger V8 6.4L, 2008-2010 Charger V8 6.1L, 2011-2015 Durango V8 5.7L, 2006-2009 Durango V8 5.7L, 2005-2008 Magnum V8 5.7L, 2006-2008 Magnum V8 6.1L.Ignition coil packs and spark plugs. NOTE: Before purchasing, please use Amazon vehicle fitment tool and check product details to confirm compatibility with your vehicle.
- Vehicle Fitment-2:Compatible with Jeep: 2012-2014 Grand Cherokee V8 6.4L, 2006-2010 Grand Cherokee V8 6.1L, 2006-2015 Grand Cherokee V8 5.7L, 2006-2010 Commander (XK) V8 5.7L,; Compatible with Chrysler: 2012-2014 300 V8 6.4L, 2005-2010 300 V8 6.1L, 2008-2015 300 V8 5.7L, 2007-2009 Aspen V8 5.7L. Note: Before purchasing, please use Amazon vehicle fitment tool and check product description details to verify the compatibility of this item with your vehicle.
- Excellent Function:Faulty ignition coil pack & spark plug may result in engine misfire,rough engine idle,decrease in power,poor fuel economy etc.Our coil packs and spark plugs are engineered to meet or surpass factory-grade specs for simple installation.Rigorous testing and premium materials offer great strength, durability, reliable cold starts and smoother engine operation.
- High Quality:Iridium spark plug can work 100000 kilometers,consistent and stable spark,have a much longer working life,the car will start quickly and speed up in a short time as powerful as a new car;Ignition coils adopt epoxy resin & high-strength engineering plastic housings to prevent the ignition coils from being melted due to overheating of the engine.Highly conductive copper wire and high dielectric performance epoxy ensure excellent connectivity and long service life
- Replace Part Number: Coil:UF504, UF-504, GN10352, E1004, C1526, 68060346AA, 5C1569, 56029129AA, 56029129AB, 56029129AF; Spark plug: 92145,LZFR5CI-11,68143877AA, 68143877AB, SP143877AA.Package included: Ignition Coil Packs x8,Double Iridium Spark Plug x12.Ignition coils and plugs easy to install.All spark plugs have been pre-set to the correct factory gap.No additional adjustment is needed—simply install them for plug-and-play use.
- COMPLETE IGNITION TUNE UP KIT – Includes 8 ignition coil packs UF504 and 16 premium iridium spark plugs 92145.This coil packs and spark plugs set restores ignition performance, improves engine response, reduces misfires, and helps maintain smooth acceleration and fuel efficiency.
- EXACT OEM REPLACEMENT – Designed to match OE specifications for fit, form, and function. Replaces worn ignition coils and spark plugs for dependable starting, stable idling, and consistent engine performance. Reference Coil Number:92145, LZFR5CI11, 9055, 9673, 8162, REC12WMPB5, FR8SII33X, 6734, FR8SPP30X, REC10WMPB, UF504.
- IMPROVED IGNITION PERFORMANCE – Delivers strong and stable spark energy to help eliminate rough idle, hesitation, engine misfires, hard starts, and loss of power caused by failing ignition components.
- VEHICLE FITMENT – Compatible with [Chrysler] 2009-2023 300 5.7L(Except 2013), 2009-2009 Aspen GAS, [Dodge] 2009-2023 Charger 5.7L, 2011-2023 Durango 5.7L GAS, 2009-2022 Challenger 5.7L, 2009-2010 Ram 1500/2500 5.7L, 2009 Ram 3500 5.7L, Durango 5.7L GAS, [Jeep] 2009-2023 Grand Cherokee 5.7L, 2022-2023 Wagoneer 5.7L, 2021-2023 Grand Cherokee L 5.7L, 2009-2010 Commander 5.7L, [Ram] 2011-2022 1500 5.7L, 2019-2023 1500 Classic 5.7L, 2011-2018 2500/3500 5.7L
- WARIM TIPS - Please enter your vehicle’s year, make, and model to verify fitment before purchasing.
- Vehicle Fitment-1: Spark Plug Compatible with Chevy Cavalier 2002-2005 L4 2.2L, Cobalt 2008-2010 L4 2.0L, HHR 2008-2010 L4 2.0L, Malibu 2013-2015 L4 2.5L, Malibu Limited 2016 L4 2.5L, Impala 2014-2019 L4 2.5L, Colorado 2015-2022 L4 2.5L, Blazer 2019-2021 L4 2.5L. Spark Plugs Compatible with Dodge Ram 1500 2003-2008 V8 5.7L, Ram 2500 2003-2008 V8 5.7L, Ram 3500 2003-2008 V8 5.7L, Durango 2004-2008 V8 5.7L, Charger 2006-2008 V8 5.7L, Magnum 2005-2008 V8 5.7L. Bujías para Carro Compatible with Jeep Grand Cherokee 2005-2008 V8 5.7L, Commander 2006-2008 V8 5.7L, Grand Cherokee 2006-2010 V8 6.1L
- Vehicle Fitment-2: Bujias Compatible with Chrysler 300 2005-2008 V8 5.7L, Aspen 2007-2008 V8 5.7L. Spark Plugs for GMC Canyon 2015-2022 L4 2.5L, Acadia 2017-2021 L4 2.5L. Spark Plugs 16 Pack Compatible with Buick Envision 2017-2020 L4 2.5L, LaCrosse 2018-2019 L4 2.5L. Car Spark Plugs Compatible with Cadillac ATS 2016 L4 2.5L. Bujías Compatible with Saturn LW1 2000 L4 2.2L
- ENA Automotive Replacement Spark Plugs Reference Number: 570 RE14MCC4 56028374AB AP5263. Engineered with pre-gapped features for easy installation, the ENA sparkplugs are compatible with 2000 2002 2003 2004 2005 2006 2007 2008 2009 2010 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 300 Acadia Aspen ATS Blazer Canyon Cavalier Charger Cobalt Colorado Commander Durango Envision Grand Cherokee HHR Impala LaCrosse LW1 Magnum Malibu Limited Ram 1500 Ram 2500 Ram 3500 2.0L 2.2L 2.5L 5.7L 6.1L engines
- ENA 570 Sparkplug Specifications: 1. Gap Size (IN): 0.051; 2. Hex Size (IN): 0.63; 3. Thread Diameter (MM): 14. The ENA spark plugs set incorporates a fine-wire iridium center electrode design that ensures precise ignition while enhancing throttle response and reducing misfires through more focused spark delivery, resulting in improved fuel efficiency
- Package Content: Set of 16 Spark Plugs; 12-Month Warranty. Drive forward with durable sparkplugs set. Please enter your vehicle in your Amazon Garage above to see if this part is compatible with your vehicle
Choosing the Best Spark Plug for Your 5.7L Hemi Engine
Your 5.7L Hemi engine is a powerhouse. It needs the right spark plugs to run smoothly and give you the best performance. Picking the wrong plug can cause misfires, poor gas mileage, and even damage. This guide helps you find the perfect spark plug for your truck or car.
Key Features to Look For
When shopping for Hemi spark plugs, focus on these main features:
- **Heat Range:** This is super important. The heat range controls how hot the plug tip gets. Too cold, and it fouls up with carbon. Too hot, and it can cause engine knocking. Most stock Hemi engines use a specific factory heat range. Always check your owner’s manual first.
- **Gap Setting:** The gap is the tiny space between the center and ground electrodes. Modern Hemi engines often require a very specific, small gap (usually around 0.040 inches or sometimes pre-gapped). Incorrect gapping hurts performance.
- **Thread Size and Reach:** Make sure the plug physically fits the cylinder head. Hemi engines use specific thread sizes (like M14x1.25mm) and a certain reach length. Mismatching these causes leaks or damage.
Important Materials Matter
The material used in the center electrode greatly affects how long the plug lasts and how well it fires.
Original Equipment Manufacturer (OEM) plugs often use copper cores because they conduct electricity very well. However, copper wears out fast. For long-term use, look for modern materials:
- **Platinum:** A good upgrade. Platinum center electrodes last much longer than copper. They maintain a consistent gap better over time.
- **Iridium:** This is the top choice for longevity and consistent performance. Iridium is extremely hard and resists wear much better than platinum. These plugs can last over 100,000 miles. They offer the sharpest, most powerful spark.
Factors That Improve or Reduce Quality
Quality spark plugs give you better fuel economy and more power.
What improves quality? High-quality construction means the insulator is strong, preventing voltage leaks. Fine-wire electrodes (like those on iridium plugs) concentrate the spark energy. This helps the fuel burn completely, which is good for horsepower and fuel use.
What reduces quality? Cheap materials cause the electrode to erode quickly. When the gap widens, the coil has to work harder to jump the spark. This can lead to misfires under heavy load (like towing). Also, poorly made shells might corrode inside the engine head, making future removal difficult.
User Experience and Use Cases
How you use your Hemi truck or car changes the best plug choice.
If you mostly drive on the highway or commute daily, an iridium or platinum plug offers excellent “set it and forget it” reliability. You do not need to check the gap for years.
If you heavily modify your Hemi—adding a supercharger, turbocharger, or running special high-octane fuel—you might need a “colder” plug. A colder plug dissipates heat faster. This prevents pre-ignition (engine knocking) caused by the extra heat from forced induction. Always consult a performance tuner for modified engines.
10 Frequently Asked Questions (FAQ) About 5.7L Hemi Spark Plugs
Q: Do I have to use OEM plugs in my 5.7L Hemi?
A: Not necessarily. Many high-quality aftermarket iridium or platinum plugs work just as well or better than the factory plugs. Always match the heat range.
Q: How often should I change the spark plugs in my Hemi?
A: If you use standard copper plugs, change them around every 30,000 miles. If you use iridium plugs, you can usually go 80,000 to 100,000 miles before replacement.
Q: What does “pre-gapped” really mean?
A: Pre-gapped means the manufacturer set the gap close to the required size before shipping. However, shipping can sometimes knock the gap out of alignment. You should always check the gap yourself before installing any plug.
Q: Can I use a spark plug with a larger gap?
A: No. A larger gap requires much more voltage to jump. Your factory ignition coils are only designed for a specific gap. A gap that is too wide causes weak sparks and misfires.
Q: What happens if I use the wrong heat range?
A: A plug that is too hot can cause the electrode to glow, igniting the fuel before the piston is ready. This is dangerous knocking. A plug that is too cold will not burn off deposits and will quickly foul up.
Q: Are iridium plugs worth the extra cost?
A: Yes, for most people. They last significantly longer and provide a more consistent spark, which means better efficiency over the plug’s life.
Q: Can spark plugs improve my gas mileage?
A: Worn-out plugs waste fuel because they cause incomplete combustion. Replacing them with the correct, healthy plugs restores factory efficiency, but new plugs do not magically give you better mileage than when the engine was brand new.
Q: Do I need special tools to change Hemi plugs?
A: Yes. Hemi engines often require a long extension and a specific size spark plug socket, usually one with a rubber boot inside to hold the plug securely when removing or installing it deep in the cylinder head.
Q: My Hemi is running rough after changing plugs. What went wrong?
A: First, check that all spark plug wires or coil boots are fully seated. Second, double-check that you set the gap correctly. Third, ensure the plugs are torqued down properly—not too loose and not overtightened.
Q: Should I use anti-seize compound on the threads?
A: Many modern spark plugs come with special plating and do not require anti-seize. If the manufacturer of your specific plug warns against it, skip it. Overtightening them with anti-seize can damage the cylinder head threads.