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NGK Iridium IX LZTR7AIX-13 Spark Plugs (Set of 16) (03-08 5.7L, 06-10 6.1L, 11+ 6.4L) - 5107

Product Code: 5107
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High Horse Performance is Veteran Owned & Operated

The Spark Plug Serious Enthusiasts Rely On. Designed specifically for the performance enthusiast. Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling. Fine Iridium tip ensures high durability and a consistently stable spark. Iridium alloy has extremely high melting point, perfect for today's high-tech, high-performance engines. "Trivalent Metal Plating" has superior anti-corrosion and anti-seizing properties. Outstanding acceleration, high fuel efficiency and durability. Ultimate in design, technology and performance.


  • Shorty Spark Plug: No
  • Resistor: Yes
  • Manufacturer Heat Range: 7
  • Electrode Core Material: Copper
  • Electrode Tip Material: Iridium
  • Insulator Type: Projected
  • Spark Plug Thread Size: 14mm
  • Spark Plug Reach: 0.984 in.
  • Spark Plug Seat Style: Tapered
  • Wrench Diameter: 5/8 in.
  • NGK Part Number: LZTR7AIX-13