NGK 7164 Iridium IX Spark Plugs TR55IX (8 Pack)

NGK 7164 Iridium IX Spark Plugs TR55IX (8 Pack)

Q: Would these work good in a supercharged 04 mustang ?

No. You need a smaller gap like .032 - .035 depending how much boost you got. These are gapped at .059 which would take too much bending to gap it down. NGK says not to change gap more than .008. NGK TR6ix would work better with preset gap at .039

Q: The NGK TR55IX plugs do not fit a 2002 Tahoe, 5.3l flexfuel. Must use the TR5IX. Too many places including parts stores are selling the wrong plug.

I don’t know why you think the TR55IX won’t work, just a slightly cooler plug than the TR5IX. In a lot of climates, it would probably help more than hurt.

Q: What is the gap preset on this plug?

Hi, Set of 8 TR55IX NGK Iridium IX plugs Gap: 1.5mm Heat: "5" Seat: taper NOTE: these are very similar to TR5IX, the difference is: TR5IX have 1.0mm gap and TR55IX have 1.5mm gap. They are the same heat rating, length, etc. NOT SUITABLE FOR Ford TS50 with alloy heads. Hope this info will help you make a decision.

Q: Are these "one piece" spark plugs unlike the three piece design that comes as oem 2005 f150 4.6l?

I installed these plugs in a 2002 Mercury Mountaineer 4.6 liter and they were one piece....easy to install ...make sure you use anti seize compound on the threads...and gap them properly to specs...the motorcraft plugs are prone for breaking off inside the vehicles because they get too hot and become brittle after awhile...and most people dont change them every 40-50,000 miles...definetely recommend the NGK's

Product ID: 12620812

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Details

Brand
NGK
Core Material
Iridium
Thread Size
14mm
Top Material Type
Iridium
Vehicle Service Type
Motorcycle

⚡Iridium core for superior ignition

🔩14mm precision thread size

🏍️Optimized for motorcycle engines

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NGK 7164 Iridium IX Spark Plugs TR55IX (8 Pack)

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Description

⚡ Ignite your ride with NGK Iridium IX – where power meets precision!

TRUSTED OEM QUALITY - NGK, the world’s largest OEM spark plug supplier, guarantees reliability and compatibility with your vehicle.
BULK PACK CONVENIENCE - 8-pack supply means you’re ready for multiple tune-ups or sharing the upgrade with your crew.
DURABILITY THAT LASTS - Engineered for longevity, these plugs resist wear and corrosion, keeping your engine firing strong mile after mile.
PRECISION FIT GUARANTEED - 14mm thread size ensures perfect OEM-spec installation, minimizing maintenance hassle.
UNMATCHED IGNITION POWER - Iridium IX core delivers consistent, high-performance sparks for smoother rides and quicker starts.

NGK 7164 Iridium IX Spark Plugs (8 Pack) combine iridium core technology with OEM precision to deliver superior ignition performance and durability. Designed specifically for motorcycles with a 14mm thread size, these spark plugs ensure reliable starts and long-lasting engine efficiency. Backed by NGK’s global reputation as the largest OEM spark plug supplier, this pack of eight offers both convenience and trusted quality for professional-grade vehicle maintenance.

Specifications

Brand	NGK
Core Material	Iridium
Thread Size	14mm
Top Material Type	Iridium
Vehicle Service Type	Motorcycle
Automotive Fit Type	Vehicle Specific Fit
UPC	087295071649
OEM Part Number	FORD%1315691
Manufacturer	NGK
Item Weight	11.5 ounces
Product Dimensions	4.2 x 3.6 x 1.1 inches
Item model number	7164
Is Discontinued By Manufacturer	No
Manufacturer Part Number	7164 TR55IX
Position	Center

Have a Question? See What Others Asked

Would these work good in a supercharged 04 mustang ?

The NGK TR55IX plugs do not fit a 2002 Tahoe, 5.3l flexfuel. Must use the TR5IX. Too many places including parts stores are selling the wrong plug.

What is the gap preset on this plug?

Are these "one piece" spark plugs unlike the three piece design that comes as oem 2005 f150 4.6l?

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