NGK 2309 Iridium IX LFR7AIX Spark Plug Set (16) for 09-24 5.7L VVT & 15-24 6.2L HEMI
NGK Iridium IX plugs are built for performance engines. The 0.6mm fine-wire iridium center electrode lowers the voltage needed to fire, so your factory ignition makes a brighter, more consistent spark. The taper-cut ground electrode reduces quenching for better flame-kernel growth, sharper throttle response and strong anti-fouling resistance. Trivalent metal plating resists corrosion and seizing, and the copper core pulls heat out of the tip.
Fits
- 2009-2024 5.7L HEMI VVT (Charger R/T, Challenger R/T, 300C, Grand Cherokee, Durango R/T, RAM 1500/2500)
- 2015-2024 6.2L Supercharged HEMI (Hellcat, Demon, Redeye, Trackhawk, Durango Hellcat, RAM TRX)
Specifications
- NGK stock number: 2309 / LFR7AIX
- Heat range: 7
- Thread: 14mm x 1.25
- Reach: 26.5mm (1.04")
- Seat: Gasket
- Hex: 5/8" (16mm)
- Gap: 0.8mm (.031")
- Center electrode: 0.6mm iridium fine wire
- Resistor: Yes (5k ohm)
- Quantity: 16 plugs (complete HEMI set)
Why Iridium IX
- Lower firing voltage and a stronger spark from the stock coils
- Better throttle response, plus resistance to fouling on tuned and supercharged engines
- Corrugated ribs prevent flashover; triple seals prevent leakage
- Pure alumina silicate insulator for strength and heat transfer
FAQ
Why 16 plugs?
The HEMI fires two plugs per cylinder, so a V8 HEMI needs 16. This set does the whole engine.
Will this work on a supercharged Hellcat?
Yes. LFR7AIX is a common choice on 2015+ 6.2L supercharged HEMIs. If your tuner recommends a colder plug for big power, ask us before ordering.
Do I need to gap them?
They come pre-gapped at 0.8mm (.031"). Check the gap before you install them, and don't pry on the fine iridium tip.
Questions about fitment or heat range for your build? Call 954-507-6261 or email sales@americanmuscleperformance.net.
