R-7420-10 Racing Spark Plug by NGK

R-7420-10 Racing Spark Plug by NGKA great option for you Race or Trackday MAZDA RX8, this deal is for a SET of 4 These plugs are performance option made in Japan by NGK he NGK R7420 10 is a high performance racing spark plug designed for extreme conditions, featuring an iridium tipped center electrode and platinum ground electrode for enhanced ignition, durability, and throttle response in modified motorsport engines, known for its heat resistance, reliability, and specialized ring

A great option for you Race or Trackday MAZDA RX8, this deal is for a SET of 4

These plugs are performance option made in Japan by NGK

 he NGK R7420-10 is a high-performance racing spark plug designed for extreme conditions, featuring an iridium-tipped center electrode and platinum ground electrode for enhanced ignition, durability, and throttle response in modified/motorsport engines, known for its heat resistance, reliability, and specialized ring-shaped earth electrode for high RPMs. 

• Type: Racing Spark Plug.
• Electrode: Fine-wire Iridium center electrode & Platinum ground electrode for better sparking and longevity.
• Design: Ring-shaped earth electrode to handle high-speed engine conditions (15,000+ RPM).
• Insulator: Pure alumina silicate ceramic for strength and heat transfer.
• Core: Copper core for efficient heat removal.
• Plating: Trivalent metal plating for anti-corrosion and anti-seize.
• Insulator Nose: Special configuration to improve throttle response.
• Ribs: Corrugated ribs to prevent flashover.
• Seals: Triple seals to prevent leakage.
• Resistor: Yes (R-type).
• Thread Size: 14mm.
• Reach: 21.5mm (0.846").
• Hex Size: 20.64mm (13/16").
• Seat Type: Gasket.