SKU#: R5671A-9 (Each)

The NGK 5238 R5671A-9 Racing Spark Plug is built to perform in extreme, high-compression race environments. It features a V-Cut nickel center electrode with a non-projected design, delivering precise ignition and improved combustion at high RPMs. Designed for throttle-sensitive builds, this Racing Spark Plug is trusted by performance builders for consistent results under maximum load.

Its copper core ensures superior heat removal, while the alumina silicate ceramic insulator adds mechanical strength and thermal control. Corrugated ribs reduce flashover, and triple seals offer leak-free protection under racing conditions. This durable spark plug delivers quick starts, clean combustion, and long-term reliability. It is ideal for use in track vehicles, not daily drivers.

Whether you’re building a drag car or tuning a circuit setup, this NGK spark plug is engineered for the most demanding applications. Choose PLUG BY NGK, and get the performance edge trusted by top racers and tuners.

Key Features:

• V-Cut nickel center electrode for efficient spark concentration

• Copper core for excellent thermal conductivity

• Corrugated ribs prevent high-voltage flashover

• Pure alumina silicate ceramic ensures strength and heat control

• Triple-seal design resists combustion leakage

• Non-resistor and non-projected for max performance

Specifications:

• Thread Diameter: 14mm

• Thread Pitch: 1.25mm

• Reach: 19mm (3/4")

• Hex Size: 5/8" (16mm)

• Gap: .031" (0.8mm)

• Terminal Type: Solid

• Heat Range: 9

• Resistor: No (1k Ohm)

• Torque Specs: Cast Iron: 18–25.3 lb. ft. | Aluminum: 18–21.6 lb. ft.

• Quantity: 1

• Warranty: N/A

• Longevity: Up to 30,000 miles

Compatibility:

For racing use only. Ideal for high-output, track-prepped engines requiring quick ignition and superior heat dissipation. Not intended for standard road vehicles. Perfect for drag, circuit, or tuned motorsport builds needing a high-performance racing spark plug.