NGK 7913 Spark Plug

NGK Laser Iridium Spark Plug 7913

NGK 7913 is a Laser Iridium High Ignitability spark plug built for OE-style ignition performance and long service intervals. It uses an iridium center electrode, a square platinum ground electrode tip, and a 0.032 in pre-gap to support consistent spark delivery in modern high-compression engines.

Compatible With select Dodge Durango, Ram 1500, Dodge Charger, Dodge Challenger, Jeep Grand Cherokee, and Subaru applications, this NGK Laser Iridium High Ignitability Spark Plug is specified for a wide range of factory-recommended service intervals. The SILFR6A design reflects NGK’s OE-focused engineering for vehicles that require precise ignition characteristics.

Key Features

• Laser Iridium High Ignitability design for stable ignition performance
• Iridium center electrode tip with copper core for efficient spark transfer
• Square platinum ground electrode tip for durability and consistent firing
• 0.032 in pre-gap for listed OE-style applications
• 5,000 ohm resistance and flat seat construction
• 14 mm thread diameter, 26.5 mm reach, 5/8 in hex
• NGK part number 7913, also identified as SILFR6A

Product Details

NGK is a major OE spark plug supplier in North America, and this plug reflects that background with a focus on original-equipment standards, durability, and operational consistency. The Laser Iridium High Ignitability line is used where the engine calls for a precise spark plug design to maintain factory ignition behavior. This part cross-references DENSO Auto Parts 4704 for the same application.

Common Uses

• Restoring misfire-related drivability concerns
• Addressing rough idle or hesitation tied to worn plugs
• Replacing plugs at the factory service interval on Dodge Durango and Ram 1500 applications
• Maintaining ignition performance on Subaru WRX STI, WRX, Impreza, Forester, Legacy, Outback, and Tribeca applications
• Supporting OE-style spark delivery in Dodge Charger and Dodge Challenger engines

Installation Notes

Verify engine code, plug reach, seat type, and gap before installation. This plug uses a flat seat, non-removable nut terminal, and a 0.032 in pre-gap on listed applications; Subaru fitments in the data also reference a 0.030 in OE gap requirement. Follow the vehicle service manual for torque and replacement procedure, and inspect ignition coils and boots during service.

Quality Assurance

NGK manufactures spark plugs for domestic and import vehicles and supports OE-level standards across its product range. Part number 7913 is built for factory-recommended service use in the listed applications, including Dodge Durango, Ram 1500, and Subaru models.