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NGK 4477
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Laser Iridium
Laser Iridium® spark plugs provide superior ignitability and long service life. Smallest tip diameter available Iridium / Platinum surfaces ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions
  • Laser welded Iridium center electrode tip
  • Platinum disc welded to backside of ground electrode provides long life
  • Trivalent Metal Plating for superior anti-corrosion and anti-seizing
  • Tapered ground electrode to minimize quenching
  • Consistent and stable spark
  • Faster starts and quicker acceleration
  • Better fuel economy and lower emissions

Spark Plug Type Performance Differences



Correct Way to Check, Set, and Adjust Your Spark Plug Gap

Technical Bulletin for 5.4L 2004-2005 Ford F-150, Expedition, Super Duty & Lincoln Navigator
Center Electrode Core MaterialCopper Core
Center Electrode Tip MaterialIridium
Gap Size0.052 in
Ground Electrode Quantity1
Hex Size5/8"
Insulator HeightISO
Manufacturer Heat Range6
Additional Info5K Ohm
Seat TypeTapered
Reach17.5mm
Thread Diameter14 MM
Ground Electrode Tip DesignStandard
Ground ConfigurationStandard
Ground Electrode Core MaterialCopper Core
Alternate/OEM Part Number(s): ITR6F13

NGK Warranty Information
Spark Plug Wires: Limited Lifetime; All Other Parts: 60 Days