NGK Racing Spark Plug, 14mm, 3/4" reach, retracted tip

Various heat ranges.
Item number: R5671A-11

NGK Spark Plugs can be found in every racing venue throughout the world. Whether you're a weekend warrior or an accomplished racer NGK Spark Plugs is sparking winners!

You'll have confidence knowing you have the World Leader in spark plug technology firing your way to victory! To withstand the severe conditions that occur in racing engines.



  • Electrode materials: Many use precious metals such as platinum or gold/palladium for greater durability and lower voltage requirements.
  • Electrode configurations: Fine-wire center electrodes provide better sparking and enhanced ignitability. Fine-wire ground electrodes further improve the ignitability of the plug.
  • Insulator configurations: Special configurations are used for the insulator noses to improve throttle response.



Center electrode core material:  Copper.
Center electrode tip material:  Nickel.
Electrical terminal type:  Non-removable nut.
Gap size (IN):  .020".
Ground configuration:  Standard.
Ground electrode core material:  Nickel.
Ground electrode quantity:  1.
Ground electrode tip design:  Standard.
Hex size (IN):  5/8".
Insulator height (mm): 50.50.
Reach (IN):  .75".
Resistance (ohms):  1.
Seat type:  Flat.
Thread diameter (MM):  14.00.