Swapping plugs on a 5.7 HEMI looks simple until you learn the engine runs 16 of them, two per cylinder, tucked under a plastic intake cover. If you're hunting for the best spark plugs for 2017 ram 1500 5 7 hemi in 2027, the short answer is straightforward: iridium is the smart buy for a daily-driven truck, and NGK's Iridium IX family keeps showing up as the most consistent match in buyer reports and OEM cross-reference charts.
After sorting through verified buyer reviews and cross-checking heat ranges against Mopar's published part numbers, one set rises above the rest. The 16 pc NGK Iridium IX kit covers all eight cylinders with the correct 0.044-inch gap right out of the box. Here's how every option on this list actually behaves once it's in the truck.
Comparison Chart of Best Spark Plugs for 2017 Ram 1500 5 7 Hemi in 2027
| Product | Details | Rating | Buy |
|---|---|---|---|
Editor’s Choice  | 16 pc NGK Iridium IX Spark | ★★★★☆4.7/5 | |
Top Pick  | NGK 16 Iridium IX Spark Plugs | ★★★★☆4.7/5 | |
Best Budget  | 8 Ignition Coil 16 Iridium Spark | ★★★★☆4.4/5 | |
| ★★★★☆4.6/5 | ||
| ★★★★☆4.5/5 |
List of Top 5 Best Spark Plugs for 2017 Ram 1500 5 7 Hemi in 2027
Picking plugs for a 5.7 HEMI comes down to four things: correct heat range, gap accuracy out of the box, electrode material, and whether the kit actually ships 16 pieces. Every option below was checked against those criteria plus the ratio of verified buyer complaints to total reviews. Expect a mix of pure plug sets and coil-plus-plug bundles, since misfires rarely show up alone.
Below are the list of products:
1. 16 pc NGK Iridium IX Spark
This is the kit we'd point a friend toward first. It ships exactly 16 plugs, matches the 2011 through 2021 Ram 1500 5.7L V8 application list, and arrives pre-gapped to the factory 0.044-inch figure. Aggregate buyer reviews back that up with a steady 4.7/5.
Why I picked it
Two details pushed this kit to the top. It ships 16 plugs, which matches the HEMI's two-plugs-per-cylinder layout exactly, so you're not ordering a second box halfway through the job. And the Iridium IX fine-wire center electrode holds its gap far longer than copper in stop-and-go driving, based on the wear patterns buyers describe.
Key specs
- Set of 16, application covers Ram 1500 5.7L V8 from 2011 through 2021
- Iridium fine-wire center electrode with tapered ground electrode
- Pre-gapped to 0.044 inch (1.1 mm), the factory figure for the 5.7 HEMI
- Heat range matched to the OEM plug number, no re-gapping required
- 4.7/5 reported rating across a large verified purchase base
Real-world experience
The pattern that repeated across buyer feedback was cold-start behavior. Owners in northern states reported the truck catching faster on the first crank at temperatures below 20 degrees Fahrenheit after moving off worn copper plugs. Towing owners also noted a steadier idle under load, though nobody should expect a measurable fuel economy jump.
On a stock truck this is a plug-and-go job with basic hand tools and a torque wrench.
- 16 plugs in one box, matching the HEMI’s two-per-cylinder design
- Pre-gapped to 0.044 inch, so no gapping tools or guesswork
- Iridium tip resists erosion well past 60,000 miles in buyer reports
- Stable 4.7/5 rating across a very large review base
- Costs more per plug than copper, which stings if you change often
- Counterfeit NGK boxes circulate online, so buy from a listing with real review history
- Deep plug wells on the 5.7 need a wobble extension you may not own
- ✔ Your 2017 Ram is a stock daily driver past 100,000 miles
- ✔ You tow a trailer and want a stable idle under load
- ✔ You plan to keep the truck another five years or more
- ✖ You’re flipping the truck within a year and want the cheapest option
- ✖ Your coils are already failing at 150,000 miles, since plugs alone won’t fix that
2. NGK 16 Iridium IX Spark Plugs
Same plug family, wider application list. This set covers Chrysler, Dodge, Jeep, and Ram 5.7 and 6.4 V8 engines, which matters if your driveway holds more than one HEMI. Buyer feedback sits at 4.7/5, right alongside the first pick.
Why I picked it
This one earns a spot because of coverage, not novelty. It's the same Iridium IX plug, packaged for a broader range of LX-platform and Ram applications, so a 300 or Grand Cherokee owner gets the same electrode design. For a two-truck household, that simplifies stocking a spare set.
Key specs
- Set of 16 Iridium IX plugs
- Fits Chrysler, Dodge, Jeep, and Ram 5.7L and 6.4L V8 engines
- Iridium fine-wire center electrode, tapered ground electrode
- Factory-matched heat range for the 5.7 HEMI
- 4.7/5 reported rating from verified buyers
Real-world experience
Buyer reports here skew toward grand Cherokee and Charger owners as much as Ram drivers, and the notes read similarly: quicker cold cranking, cleaner idle, and no plug fouling after 50,000 miles in mostly highway use. One recurring complaint is packaging, since a few buyers received boxes that looked resealed. Check the electrode tips on arrival, then install with confidence.
- Fits both 5.7 and 6.4 HEMI engines, useful for multi-truck garages
- Genuine Iridium IX electrode design with long gap retention
- Same 4.7/5 rating pattern as the top pick
- Works as a direct OEM replacement with no tuning changes
- A handful of buyers reported resealed or dented packaging on arrival
- No coils included, so it won’t solve an existing misfire on its own
- ✔ You own both a 5.7 Ram and a 6.4 Jeep or Charger
- ✔ You want a spare set on the shelf for the next service
- ✔ You’re sticking with an OEM-equivalent plug
- ✖ You already know one coil is dead and want a single-order fix
- ✖ The listing for your exact year is out of stock, since the top pick covers 2011 to 2021
3. 8 Ignition Coil 16 Iridium Spark
This is the one you buy when the truck is already stumbling. It bundles 8 ignition coils with 16 iridium plugs, cross-referenced to UF504, 92145, and C1526. For anyone replacing a coil pack anyway, the math gets hard to argue with.
Why I picked it
A HEMI misfire almost never comes from the plug alone once you pass 120,000 miles. Coil packs fail on the same schedule, and buying them separately doubles your downtime. This bundle covers a full ignition refresh in one order, and the 4.4/5 rating reflects a large sample of buyers doing exactly that.
Key specs
- 8 ignition coils plus 16 iridium spark plugs
- Cross-references UF504, 92145, and C1526 coil numbers
- Fits Ram 1500 and 2500 5.7 V8, plus Charger, Challenger, Durango, Grand Cherokee, and Chrysler 300
- Iridium plug construction with factory-style heat range
- 4.4/5 reported rating across verified purchases
Real-world experience
Reviews describe the classic scenario: a flashing check engine light, a cylinder 5 misfire, and a shop quote that pushes the job past a weekend budget. Buyers who installed the full set reported the light clearing and the stumble disappearing within the first drive. A few noted that coil boot fit varies slightly, so seat each coil fully before bolting down.
If you're diagnosing an intermittent fault, reading codes properly first will save you from replacing good parts.
- Full ignition refresh in one order, 8 coils and 16 plugs
- Cross-referenced to UF504, 92145, and C1526 for easy verification
- Covers a long list of 5.7 HEMI vehicles beyond the Ram 1500
- Budget-friendly entry point compared with separate coil and plug purchases
- 4.4/5 rating trails the NGK-only sets, with some coil quality variance reported
- Broad fitment list means you must double-check your exact engine and year
- No brand pedigree on the coils compared with OEM Mopar parts
- ✔ You’re chasing a misfire and want plugs and coils together
- ✔ The truck is past 120,000 miles with original coils
- ✔ You do your own work and want to avoid a second order
- ✖ Your ignition system is healthy and you only need plugs
- ✖ You want OEM-brand coils and nothing else
4. Dragon FIRE Performance Ignition Coils &
Here's the option for older iron. Dragon FIRE's kit covers 08 through 19 model years and a spread of HEMI displacements from 5.7 up to 6.4, with coil numbers 56029129AB and UF504 printed on the cross-reference sheet. It lands at 4.6/5, a notch above the budget bundle.
Why I picked it
Coverage is the reason this one made the cut. The coil cross-reference spans 56029129AB, UF504, and 92145, and the plug side lists LZFR5CI-11, so you can verify fitment against what's already in your engine bay. It's a solid choice for a 2012 or 2015 truck that a narrower kit might not list.
Key specs
- Ignition coil and iridium plug kit, OEM fit number Kit-1565
- Fits 2008 through 2019 Dodge, Jeep, Chrysler, and Ram 5.7, 5.9, 6.1, and 6.4 V8 engines
- Coil part numbers 56029129AB and UF504, plug reference LZFR5CI-11
- Iridium plug construction with factory-style heat range
- 4.6/5 reported rating from verified buyers
Real-world experience
Feedback clusters around older, high-mileage trucks. Owners of 2008 to 2012 Rams reported the truck smoothing out on cold mornings after the full swap, and a few mentioned that the coil boots seated more firmly than the originals they pulled. One trade-off worth knowing: a small share of buyers said the fitment chart was broader than their specific trim, so measure before you buy.
If your check engine light is blinking, treat it as a priority rather than a wait-and-see item, since the National Highway Traffic Safety Administration ties prolonged misfires to catalytic converter damage.
- Covers 2008 through 2019 trucks, wider than most plug-only sets
- Coil numbers printed for easy match against 56029129AB and UF504
- 4.6/5 rating puts it ahead of the other bundle on the list
- Iridium plugs paired with the coils, so gaps stay stable longer
- Fitment list is broad enough that some trims report a mismatch
- More parts to install than a plug-only job, roughly double the labor
- Not the cheapest path if your coils are still good
- ✔ Your Ram is a 2009 to 2015 model with original coils
- ✔ You want a verified cross-reference sheet before ordering
- ✔ You’re already committing a Saturday to the job
- ✖ You drive a 2020 or 2021 truck, where the top pick fits cleanly
- ✖ You just want plugs and your coils test fine
5. 16 pc Champion Copper Plus Spark
Old-school copper, and that's not an insult. Champion's Copper Plus set runs 16 plugs specified for the Ram 1500 5.7L V8 across 2011 through 2019, and it holds a 4.5/5 rating. For a driver who changes plugs on schedule and doesn't mind doing it again sooner, this keeps the bill down.
Why I picked it
Every list needs a plain, honest copper option, and Champion has been the standard reference plug for Mopar small blocks for decades. Copper conducts well and fires reliably, and the Copper Plus line adds a suppressor core that keeps radio interference down. It's the cheapest correct plug on this page.
Key specs
- Set of 16 Champion Copper Plus plugs
- Specified for the Ram 1500 5.7L V8 from 2011 through 2019
- Copper core electrode with suppressor construction
- Factory-style heat range, gap to be confirmed before install
- 4.5/5 reported rating from verified buyers
Real-world experience
Buyer notes for this set read like fleet maintenance: work trucks, plow rigs, and trucks that get serviced every 30,000 miles whether they need it or not. Owners liked the price and the predictable performance. The catch is service interval.
Copper electrodes erode faster than iridium, so you'll be back under the hood sooner, and the plug gaps should be checked with a feeler gauge rather than trusted out of the box.
- Cheapest per-plug option here, useful for fleet or high-mileage trucks
- 16 pieces in one box with a clear 2011 to 2019 Ram 1500 application
- Suppressor core keeps ignition noise out of the radio
- 4.5/5 rating from a large verified buyer pool
- Copper electrodes wear faster, so the change interval is shorter
- Gap should be verified rather than assumed out of the box
- Not the pick for anyone who wants to forget about plugs for 60,000 miles
- ✔ You service the truck every 30,000 miles anyway
- ✔ It’s a work rig where cost per service matters
- ✔ You’re selling soon and just need it running clean
- ✖ You want the longest possible interval between plug changes
- ✖ Your truck is a 2020 or 2021 model outside this listing’s range
How I picked
We can't claim a hands-on test of every plug in a 5.7 HEMI, so here's what we actually did instead. We compared manufacturer datasheets, cross-referenced OEM part numbers against Mopar's published coil and plug figures, and read through verified buyer feedback until patterns repeated. Anything that showed up once got ignored.
Anything that showed up thirty times made the notes.
Three criteria did most of the sorting:
- Correct application. The 2017 Ram 1500 5.7 uses 16 plugs, two per cylinder, so any kit shipping 8 was automatically out. We verified year and displacement coverage against each listing's own fitment data.
- Gap and heat range accuracy. A plug that needs re-gapping before install adds a failure point. We favored sets that state a factory gap figure, and we treated vague heat range claims as a red flag.
- Review volume against complaint rate. A 4.7/5 from thousands of buyers carries more weight than a 5.0 from twelve. We also read the one and two star reviews specifically, since that's where fitment and counterfeit problems surface.
What we didn't do matters too. We didn't run a 60,000 mile durability test, and we can't measure electrode wear over time. Claims about long-term life here come from buyer reports and manufacturer specifications, not from a lab bench we built.
Anyone telling you otherwise about a spark plug is guessing.
We also leaned on how owners actually diagnose misfires. Reading codes before buying parts is the same discipline you'd apply to tracking down intermittent faults on any machine in the house. It saves money either way.
Buying guide, what actually matters for best spark plugs for 2017 ram 1500 5 7 hemi in 2027
Does the plug count match your engine?
The 5.7 HEMI runs two spark plugs per cylinder, so a complete job needs 16. That single fact eliminates half the listings on Amazon, many of which are 8 piece sets meant for other engines. Check the title for "16" before anything else.
Iridium or copper, which one should you buy?
Iridium is a metal with a very high melting point, which lets manufacturers use a fine center electrode that resists erosion far better than copper. In practice that means a longer service interval. Copper conducts electricity well but wears faster, so it needs more frequent changes.
Neither is a performance upgrade. It's a question of how often you want to be in there.
NGK's own technical documentation on heat range and electrode design is worth a read if you want the metallurgy behind it. The official NGK site covers how plug heat rating affects fouling and pre-ignition. For a stock 5.7, stick with the factory-equivalent range and skip the gimmicks.
What gap should a 5.7 HEMI plug be set to?
The factory figure for this engine is 0.044 inch, or about 1.1 mm. Many quality sets arrive pre-gapped to that number, but you should still spot-check one or two with a feeler gauge. A plug dropped in shipping can close its gap, and a closed gap causes a misfire that looks exactly like a dead coil.
Do you need new coils too?
Not unless they've failed. Coil packs on the 5.7 typically last well past 100,000 miles, and replacing good coils is money thrown away. A misfire that moves to a different cylinder when you swap coils is a coil problem.
A misfire that stays put is usually the plug or the injector. Confirm before you buy a bundle.
Should you check for a stored fault first?
A blinking check engine light means active misfiring that can dump raw fuel into the catalytic converter. The National Highway Traffic Safety Administration maintains recall and safety information worth checking for your model year before spending anything. Clearing a code without fixing the cause just delays the same problem, the same way a stubborn appliance code keeps returning until the underlying fault is addressed.
Our writeup on stubborn error codes makes the same point in a different context.
What about torque and installation?
The 5.7 uses a relatively modest torque spec on its plugs, and over-tightening is a real risk on aluminum heads. Use a torque wrench, not a wrist estimate. Threads should start by hand before any socket touches them.
Cross-threading a plug well turns a two hour job into a head removal, which is a very different kind of weekend.
Frequently Asked Questions (FAQ)
Are iridium plugs worth it for a 2017 Ram 1500 5.7?
Yes, for most owners. Iridium's fine electrode holds its gap far longer than copper, so you're not paying for horsepower, you're paying to avoid a repeat of a job that requires pulling the intake cover and reaching 16 deep plug wells. If you do your own labor and don't mind the interval, copper is a legitimate budget choice.
How often should I change spark plugs in a 5.7 HEMI?
Copper plugs typically get replaced around 30,000 miles, while iridium sets commonly run to 60,000 or beyond based on manufacturer guidance and owner reports. Driving style matters. Short trips and heavy towing both accelerate wear, so a truck that works for a living should be inspected sooner than a highway cruiser.
Will new spark plugs fix a misfire on my Ram?
Only if the plugs are the cause. A worn plug with an eroded electrode can absolutely cause a misfire, and replacing all 16 often clears it. But if a coil pack, injector, or wiring harness is at fault, new plugs won't change anything.
Read the code, identify the cylinder, and confirm the cause before spending.
Can I mix spark plug brands in a 5.7 HEMI?
You can, but you shouldn't. Different brands and models use different electrode materials and heat ranges, so mixing them creates uneven combustion across cylinders. Keep all 16 identical.
It's also a good reason to buy a full set rather than topping off with whatever's on the shelf.
Do I need to gap new plugs before installing them?
Check them even if they're advertised as pre-gapped. Most quality sets leave the factory at the correct 0.044 inch figure, and a spot check takes a minute with a feeler gauge. Never use a coin-style gapper on an iridium plug, since it can crack the fine electrode tip.
Final verdict
If you want the simplest correct answer, buy the 16 pc NGK Iridium IX set. It ships all 16 plugs at the right gap, fits the 2011 to 2021 range including your 2017, and holds a 4.7/5 rating that reflects a genuinely large buyer base. The wider-coverage NGK 16 Iridium IX set is the runner-up, and it's the smarter call if a 6.4 HEMI shares your driveway.
Affiliate disclosure: This post contains affiliate links. If you buy through one of these links, I may earn a small commission at no extra cost to you. It never changes my recommendation, I only suggest gear I'd actually buy myself.