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NGK Iridium Spark Plug Box of 4 (LFR7AIX) 6.2L, 5.7L

NGK
NGK2309
87295123096
Spark Plugs
20+ Units In Stock - Ships Next Business Day
Engine, Ignition, NGK, Spark Plugs
$ 90.60
$ 90.60

SKU: 2309 / UPC: 87295123096


NGK Iridium IX Spark Plugs LFR7AIX (Box of 4) for 2009–2024 5.7L & 2015–2024 6.2L HEMI

Optimize ignition performance in your 2009–2024 5.7L VVT or 2015–2024 6.2L HEMI engine with NGK Iridium IX Spark Plugs (LFR7AIX). These premium iridium spark plugs deliver superior spark energy, faster combustion, and improved throttle response compared to standard plugs.

NGK Iridium IX plugs feature an ultra-fine center electrode that's designed just thick enough to ensure maximum durability and life, yet thin enough to create an accurate and consistent spark. Iridium is significantly stronger than any metal used in spark plugs today 6 times harder than platinum which has allowed NGK engineers to reduce the voltage requirement for a spark. They represent the ultimate evolution of spark plug technology and performance.

Key Features

  • Ultra-Fine Iridium Center Electrode – Superior ignitability and long life
  • Fine Wire Design – Better spark efficiency and reduced misfires
  • High Heat Resistance – Maintains performance under extreme conditions
  • Pre-Gapped – Ready to install (recommended gap adjustments below)
  • Box of 4 – Complete set for one V8 engine
  • NGK Quality – OEM supplier trusted by major manufacturers

Specifications

Detail Value
Brand NGK
Type Iridium IX Spark Plug
Stock Number 2309
Part Number LFR7AIX
Thread Diameter 14 mm
Reach 26.5 mm (1.043 in.)
Hex Size 5/8 inch
Gap (Pre-Set) 0.032 inches
Resistor Yes (5000 ohms)
Electrode Core Material Copper
Electrode Tip Material Iridium
Insulator Type Projected
Seat Type Flat (Gasket)
Quantity Box of 4
Country of Origin Japan
Warranty NGK Limited Warranty

    Whats Included

    • 4 x NGK Iridium IX Spark Plugs (LFR7AIX)

    Product Notes

    • Designed for 2009–2024 5.7L VVT and 2015–2024 6.2L HEMI V8 engines
    • Professional installation and proper gapping recommended
    • Replace in complete sets for balanced performance
    • Use of nitrous with boost may require even smaller plug gaps.

    This Part Fits

    Year Range Make Model Notes
    2009–2024 Dodge / Chrysler / Jeep / Ram Models with 5.7L VVT HEMI Verify exact application
    2015–2024 Dodge / Chrysler / Jeep / Ram Models with 6.2L HEMI (Hellcat, Demon, etc.) Verify exact application

    Why Choose NGK Spark Plugs?

    • Largest OE spark plug supplier in North America
    • Iridium IX plugs offer superior ignitability and longevity
    • Precision manufacturing for consistent performance
    • Trusted by manufacturers and performance enthusiasts worldwide

    Frequently Asked Questions

    • Q: Are these good for a stock Hellcat replacement plugs?
    • A: Yes. These are a great option for stock and modified Hellcat applications.
    • Q: Are these the right ones for 6.1L supercharged?
    • A: For boosted applications, NGK 6509 is typically recommended up to 600 RWHP.
    • Q: Is this a full set for my HEMI engine?
    • A: No. This box of 4 plugs you need to add Quantity of 4 to cart for 16 plugs total for one V8 Hemi engine.
    • Q: Is professional installation required?
    • A: While experienced DIYers can install them, professional installation ensures proper torque and anti-seize application.

    Shipping & Handling

    • Method: UPS Ground or FedEx Ground
    • Availability: In stock – ships same or next business day
    • Packaging: Secure NGK retail packaging

    Request For Information

    Have questions about NGK Iridium Spark Plug Box of 4 (LFR7AIX) 6.2L, 5.7L? Fill out the form below and we'll get back to you by the next business day.
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