1. Special Insulator Nose Configurations: These configurations improve throttle response.
2. Copper Core: The spark plug has a copper core that aids in heat removal.
3. Corrugated Ribs: These prevent flashover.
4. Pure Alumina Silicate Ceramic Insulator: Provides superior strength and better heat transfer.
5. Thread Size: 14mm
6. Gap: 0.031" (0.8mm)

These NGK racing spark plugs are recommended for racing use only and are meant to withstand the most grueling racing conditions12. They offer consistent performance and durability, making them ideal for turbocharged, nitrous, and supercharged engines3. If you’re looking for reliable spark plugs for your high-performance vehicle, the NGK R5671A-8 is a great choice!