NGK 4654 R7437-9 Racing Spark Plug 14mm Iridium Heat Range 9

The NGK 4654 Racing Spark Plug (NGK plug number R7437-9) is built for high-RPM, high-horsepower competition engines. It is an extra-cold, heat range 9 plug. The fine-wire iridium-tipped center electrode needs less voltage to ionize the plug gap and gives a strong, consistent spark. NGK is a leading OE spark plug supplier. Its racing line is made for the most demanding conditions.

Key Features:

• Fine-wire iridium-tipped center electrode for durability and ignitability
• Copper core (98% pure copper) for heat dissipation and a wide heat range
• High-grade alumina silicate ceramic insulator for strength and dielectric performance
• Trivalent metal plating for corrosion and anti-seizing protection, so it installs and removes easily
• Cold-rolled threads to help prevent cross-threading and cylinder head damage
• Resistor design, tapered ground electrode

Specifications:

• NGK plug number: R7437-9
• Thread diameter: 14 mm (M14 x 1.25)
• Reach: 26.5 mm (1.04 in)
• Seat type: Gasket
• Hex (wrench) size: 5/8 in
• Heat range: 9
• Pre-gap: 0.028 in
• Ground electrodes: 1
• Interchanges with DENSO 5347 / IKH27

Racing use only: this plug is intended for sanctioned competition and is not for vehicles operated on public roads.