NGK – TR6IX Spark Plug (3689)
$8.99
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- Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
- Corrugated ribs prevent flashover
- Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer
- Copper core aids in heat removal
- Triple seals prevent leakage
In stock
Frequently Purchased Together
Spark Plug Wires
GPI – Spark Plug Wire Set for use on 1997+ GM LS Car Engines (Standard or Extended)
From: $114.95
This product has multiple variants. The options may be chosen on the product page
From: $114.95
This product has multiple variants. The options may be chosen on the product page
Valve Cover Gaskets
OEM Style – Valve Cover Gasket Chevy LS1 / LS2 / LS6 / LS7 / L92 (12637683)
$27.99
Description
NGK IX Iridium Series plugs were designed specifically for the performance enthusiast. Fine wire center electrode ensures high durability and a consistently stable spark. Iridium alloy has an extremely high melting point, perfect for today’s high-tech, high performance engines.
- Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
- Corrugated ribs prevent flashover
- Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer
- Copper core aids in heat removal
- Triple seals prevent leakage
Questions & Answers (8)
Customer questions & answers
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I'm looking for spark plugs for a gpi 416 gen v lt1 w/gpi ported cylinder heads. LT4 injectors/HPFP 12.7:1. Thanks!
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Q I'm looking for spark plugs for a gpi 416 gen v lt1 w/gpi ported cylinder heads. LT4 injectors/HP...... Read more answer nowAsked by on May 29, 2026 6:24 pmA https://gwatneyperformance.com/ngk-ltr7ix-11-iridium-ix-spark-plug-pack-of-1-6510/
I have a 2015 Camaro 2 ss with long tube , cold air intake and performance exhaust that has been tuned will these work without fouling on hard acceleration?
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Q I have a 2015 Camaro 2 ss with long tube , cold air intake and performance exhaust that has been ...... Read more answer nowAsked by on April 4, 2026 10:30 pmA These should be fine yes
Fit a 2020+ GMC Sierra 2500 gas 6.6 L8T?
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A No these are for ls application, you'd want this one https://gwatneyperformance.com/ngk-ltr7ix-11-iridium-ix-spark-plug-pack-of-1-6510/
I have a L99 with headers and currently getting a ported rod mod and throttle body. Do these plugs have to be gapped? or will it be fine to put them in the engine out of the box?
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Q I have a L99 with headers and currently getting a ported rod mod and throttle body. Do these plug...... Read more answer nowAsked by on January 7, 2025 11:52 pmA You should be able to run them out the box
Will they fit in a 2010 L99 ss?
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A Yes
Will these fit on 2016 camaro ss ?
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A No you'll need these https://gwatneyperformance.com/product/ngk-ltr7ix-11-iridium-ix-spark-plug-pack-of-1-6510/
What heat range spark plugs recommended for ls3 corvette making 453 rwhp
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Q What heat range spark plugs recommended for ls3 corvette making 453 rwhp answer nowAsked by on June 5, 2023 12:14 pmA These will be fine for your application
I have a 2018 Silverado with the L83 5.3. Can you tell me exactly which NGK plugs fit my application?
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Q I have a 2018 Silverado with the L83 5.3. Can you tell me exactly which NGK plugs fit my applicat...... Read more answer nowAsked by on March 18, 2023 8:41 pmA I don't believe we have a stock replacement plug on our website for the lt platform, you'd probably have to get them from local dealer or other parts store
Great spark plugs for my all-motor build
Awesome
Warehouse doesn’t play. Shipped and received within 2 days of ordering. Haven’t plugged these into my Camaro yet, but have heard great things about these spark plugs from friends that are using them in their cars!
Great quality
Perfect fitment and work great