NGK 7397 Spark Plug

NGK Iridium IX Spark Plug 7397

NGK Iridium IX Spark Plug 7397 is built for drivers who need consistent ignition performance, stable idle quality, and reliable combustion across a wide range of GM, Ford, Cadillac, GMC, and Mazda applications. This NGK spark plug uses an iridium center electrode, copper core, and a tapered seat design to support dependable firing in daily-driven and high-load engines.

Key Features

• Iridium center electrode tip for precise spark delivery
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with taper-cut tip design
• 5,000 ohm resistance for ignition system compatibility
• Pre-gapped at 0.040 inches
• 14 mm thread diameter, 0.708 inch reach, 5/8 inch hex
• Tapered seat design with non-removable nut terminal

Product Details

Part number 7397 is part of NGK’s Iridium IX Spark Plug line, a product family focused on durable electrode construction and consistent ignition characteristics. NGK’s long OE manufacturing background and broad North American coverage support applications where original-equipment-style fit and dependable operation matter. This spark plug is a direct choice for many Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Corvette applications, along with a wide range of other GM and Ford vehicles listed in the fitment data. This part cross-references DENSO Auto Parts 5090 and Champion Spark Plug 7408 for the same application.

What It Helps Address

• Rough idle caused by worn spark plugs
• Hard starting from weak or inconsistent spark output
• Misfire conditions tied to electrode wear
• Reduced throttle response from inefficient combustion
• Maintenance intervals affected by plug degradation

Installation Notes and Fitment Tips

Fits 2001-2019 Chevrolet Silverado 2500 HD, N/A; set spark plug gap to 0.040 inches. Fits 2007-2019 Chevrolet Silverado 3500 HD, N/A; set spark plug gap to 0.040 inches. Fits 1999-2013 Chevrolet Silverado 1500, N/A; set spark plug gap to 0.040 inches. Fits 1997-2013 Chevrolet Corvette, N/A; set spark plug gap to 0.040 inches. Fits 2000-2014 Chevrolet Tahoe, N/A; set spark plug gap to 0.040 inches. Fits 2000-2014 GMC Yukon, N/A; set spark plug gap to 0.040 inches. Fits 2000-2013 GMC Yukon XL 2500, N/A; set spark plug gap to 0.040 inches. Fits 2000-2013 GMC Sierra 1500, N/A; set spark plug gap to 0.040 inches. Fits 2009-2014 Ford E-150, N/A; adjust spark plug gap to 0.044 inches. Fits 2009-2014 Ford E-250, N/A; adjust spark plug gap to 0.044 inches. Verify engine-specific gap requirements before installation, since listed applications include 0.040, 0.044, 0.045, 0.048, 0.050, and 0.030 inch specifications depending on vehicle.

Quality Assurance

NGK is a major OE spark plug supplier in North America with more than 80 years of automotive manufacturing experience. The brand’s OE legacy, broad vehicle coverage, and focus on original equipment standards support dependable fitment for applications such as Chevrolet Express 2500, GMC Savana 3500, and Cadillac Escalade models.