NGK 6507 Laser Iridium Spark Plug IFR6B, 14mm Thread, 0.750 in Reach

The NGK 6507 Laser Iridium spark plug (NGK plug number IFR6B) is an OE-quality iridium spark plug built for long service life and dependable ignition. It has a fine-wire iridium alloy center electrode and a resistor design, which helps suppress radio-frequency interference. NGK engineered the Laser Iridium line for OE applications, and each plug is tested to high quality and durability standards.

Key Features:

• Iridium alloy center electrode: Iridium is about six times denser than platinum and has a very high melting point. This suits modern high-efficiency engines.
• Platinum ground electrode: Unless the OE design specifies otherwise, platinum protection on the ground electrode supports ignitability and wear life.
• Copper core: A 98 percent pure copper core improves heat dissipation and conductivity. It also gives the plug a wide heat range.
• Ceramic insulator: High-grade pure alumina ceramic helps prevent overheating and supports reliable starts.
• Trivalent metal plating: The plating resists corrosion and seizing, so the plug installs and removes more easily.
• Resistor type: Yes, with a 5,000 ohm resistor value.

Specifications:

• NGK part number: 6507 (plug number IFR6B)
• Thread size: M14-1.25 (14 mm)
• Thread reach: 0.750 in
• Seat type: Gasket (flat seat)
• Gap: 0.032 in (0.8 mm pre-gap)
• Heat range: NGK 6
• Terminal: Non-removable nut
• Center electrode tip: Iridium
• Insulator: Ceramic

The plug is a good fit for engines that came with OE fine-wire iridium plugs. Replacing it with the same design keeps ignition performance close to factory standards. Cross-references include DENSO 4504, IK20TT, 4702 and PK20TT, Nissan B2401-6A0A4 and Mitsubishi MD378582.