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Return will not accepted if the product is opened or after use. All returns requests need to be within 30 days of when the original order was received. Original shipping costs will not be refunded.

NGK 5787 ILZKR7B-11S  Laser Iridium Spark Plug (4 Pack)





  • NGK Iridium IX plugs offer extreme ignitibility and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response.
  • NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability.
  • The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloys extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to a NGK RUTHENIUM HX plug.



  • FORD 2014-08
  • LINCOLN 2014-08
  • MERCURY 2010-08


Center Electrode Core MaterialCopper Core
Center Electrode Tip MaterialIridium
Ground ConfigurationStandard
Ground Electrode Core MaterialNickel Core
Ground Electrode Quantity1
Ground Electrode Tip DesignStandard
Hex Size5/8 in
Insulator Height50.00 mm
Manufacturer Heat Range7
Part NumberILZKR7B-11S
Pre-Gap Size.044 in
Reach26.5 mm
Resistance5000 Ohms
Seat TypeFlat
Stock Number5787
Thread Diameter12.00 mm



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