Product Description
NGK R5671A-10 Racing Spark Plugs Set of 8 | Heat Range 10 Non-Resistor Performance Plugs
NGK Stock #5820 | 14mm Thread | .750" Reach | Ultra-Cold Racing Spark Plugs for High Boost Applications
When your build demands maximum heat control and ignition reliability, the NGK R5671A-10 Racing Spark Plugs deliver. As part of NGK’s elite Racing Series lineup, these plugs are engineered for extreme environments including high boost, nitrous, and high-compression engines. Featuring a colder Heat Range 10 rating, they are designed to reduce the risk of pre-ignition and detonation under intense cylinder pressures. Constructed with a copper core for efficient heat transfer and a pure alumina silicate ceramic insulator for durability, these plugs maintain consistent spark performance in the harshest conditions. With advanced features like corrugated ribs to prevent flashover and a specialized insulator nose for improved throttle response, these plugs are a go-to choice for serious racers and high-performance engine builders.
Key Features & Benefits
- NGK Racing Series Engineering: Designed for extreme racing conditions including forced induction, nitrous, and high compression engine builds.
- Ultra-Cold Heat Range 10: Ideal for high boost and aggressive setups where maximum heat dissipation is critical to prevent detonation.
- Copper Core Construction: Enhances heat removal and ensures consistent spark under demanding performance conditions.
- Advanced Insulator Design: Alumina silicate ceramic with corrugated ribs improves durability and prevents electrical flashover.
- Factory Pre-Gapped: Set at .020" for high-performance applications requiring tighter spark control under extreme cylinder pressure.
Key Fitments
- Thread Size & Reach: 14mm thread diameter with .750" reach and gasketed seat design.
- Hex Size: 5/8" hex for standard spark plug socket compatibility.
- Application Use: Best suited for high-performance, racing, boosted, or nitrous applications requiring a non-resistor spark plug.
