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NGK Racing Spark Plug R5671A-9


Shipping Cut-Off:  USPS 9:30am EST / UPS 1:00pm EST

The NGK Racing Spark Plug R5671A-9 is designed for extreme use and meant to withstand the most grueling racing conditions. The center electrode features a conventional nickel alloy with a V-groove design, providing consistent performance. NGK utilizes OE ceramic technology, using high-grade alumina silicate ceramic to create a stronger insulator for optimal dielectric performance.


  • Solid Copper Core: The 98% pure copper core offers superior heat dissipation, conductivity, and ultra-wide heat ranges.
  • Cold-Rolled Threads: Prevents cross-threading and damage to cylinder heads during installation.
  • Trivalent Metal Plating: Provides superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
  • The NGK Racing spark plugs are used in various racing applications worldwide.
  • These plugs are specifically designed for high-revving, high-compression race engines.
  • They have been powering racing champions and can be found in racing venues globally.


  • Core Material: The core is made from copper, while the tip is composed of nickel alloy.
  • Heat Range: The R5671A-9 spark plug has a heat range of 9.
  • Thread Size: M14
  • Thread Reach: 0.750 inch (19mm)
  • Hex Size: 5/8 inch
  • Preset Gap: 0.032 inch (0.80mm)
  • Resistor Plug: No
  • Ground Electrode: 1 ground electrode made of nickel.
  • Insulator Height: 50mm
  • Electrical Terminal Type: Non-removable nut.