Product Description
NGK R5671A-7 Racing Spark Plugs – Set of 8
NGK Racing Series | Heat Range 7 | Stock #4091
The NGK R5671A-7 Racing Series Spark Plugs are engineered to perform under the harshest engine conditions found in high-compression, high-RPM, and performance-driven applications. Featuring NGK’s racing-proven insulator nose design, these plugs improve throttle response while maintaining consistent combustion stability. A pure alumina silicate ceramic insulator provides superior strength and heat transfer, while the copper core aids in rapid heat removal. Corrugated ribs prevent flashover, and triple sealing prevents gas leakage, making these plugs a trusted choice for serious performance engines.
Key Features & Benefits
- Built for Extreme Performance Conditions: Designed specifically for racing and high-performance engines where heat, cylinder pressure, and RPM demand superior spark stability.
- Improved Throttle Response: Special insulator nose configuration promotes consistent flame kernel development for sharper throttle response and cleaner combustion.
- Superior Heat Dissipation: Copper core construction efficiently removes heat from the firing tip, helping prevent detonation and pre-ignition under load.
- Prevents Flashover & Leakage: Corrugated ribs reduce the risk of flashover while triple seals eliminate combustion gas leakage for reliable operation.
- Matched Set of 8 Racing Plugs: Includes eight identical plugs to ensure uniform ignition performance across all cylinders.
Specifications
- NGK Stock #: 4091
- Heat Range: 7
- Thread Size: 14mm
- Hex Size: 5/8"
- Reach: .750"
- Seat Type: Gasketed
- Resistor: Non-Resistor
- Electrode Material: Copper Center Core, Nickel Electrode
- Factory Gap: .032"
