{"product_id":"a-naftuly-iridium-spark-plugs-8-pack-tr55ix-7164-for-f-150-4-6l-5-4l-direct-fit-long-life","title":"A-NAFTULY Iridium Spark Plugs 8-Pack TR55IX 7164 for F-150 4.6L\/5.4L — Direct-Fit, Long-Life","description":"\u003cp\u003e\u003cstrong\u003eA-NAFTULY Iridium Spark Plugs 8 Pack (7164 \/ TR55IX) are a direct-fit replacement set designed to restore reliable ignition for V8 4.6L and 5.4L engines used in many Ford, GM and Cadillac models from the 1980s through 2010.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese eight iridium-tipped spark plugs are built to match OE reach, heat range, and gap for compatible V8 engines, offering consistent combustion without changing engine management. Sold as a full set, they replace worn originals that can cause rough idle, reduced fuel economy, or misfires. The kit’s fitment range spans popular trucks and sedans—most notably Ford F-150 years 1997–2010—plus many GM and Cadillac applications listed in the compatibility notes.\u003c\/p\u003e\n\n\u003ch3\u003eWill these spark plugs fit my vehicle and engine?\u003c\/h3\u003e\n\u003cp\u003eThe A-NAFTULY TR55IX (7164) pack is intended for a wide group of V8 engines. It matches OE part references and is suitable where the engine requires the TR55 series reach and thread. Always verify the part reference and engine displacement before purchase.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect reference numbers: 7164, TR55IX, 3403, TR55GP, 3951, TR55\u003c\/li\u003e\n  \u003cli\u003eCommon Ford fitment: F-150 (1997–2010), Expedition\/Explorer (1997–2004), Mustang (1993–2004)\u003c\/li\u003e\n  \u003cli\u003eAlso fits many Cadillac, Chevrolet, GMC, Lincoln, Mercury applications—see full vehicle list\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do iridium tips affect ignition and longevity?\u003c\/h3\u003e\n\u003cp\u003eIridium electrodes are harder and finer than conventional nickel, producing a more-focused spark and slower electrode wear. That typically means steadier spark performance over longer service intervals compared with standard plugs. Iridium’s durability helps maintain gap integrity under normal driving conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFine center electrode improves ignition consistency\u003c\/li\u003e\n  \u003cli\u003eResists erosion to maintain gap and timing characteristics\u003c\/li\u003e\n  \u003cli\u003eDesigned for extended service intervals versus standard plugs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I expect during installation and maintenance?\u003c\/h3\u003e\n\u003cp\u003eThese plugs are sold as a complete eight-piece set so you can replace all cylinders at once for balanced performance. They install like stock plugs—use correct torque, a clean thread, and the specified gap or pre-gapped condition if provided. Inspect boots, wires, or coil packs during service and replace any damaged ignition components to avoid repeat issues.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSold as a set of 8 for full V8 replacement\u003c\/li\u003e\n  \u003cli\u003eFollow manufacturer torque specs and anti-seize recommendations\u003c\/li\u003e\n  \u003cli\u003eCheck ignition leads\/coils while changing plugs for complete repair\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat warranty and support come with the A-NAFTULY set?\u003c\/h3\u003e\n\u003cp\u003eA-NAFTULY provides a 12-month worry-free warranty covering defects and fitment issues originating from the product. Their customer support is available for fitment questions and replacement requests if you encounter a covered problem. Keep your purchase details and vehicle information ready when contacting support.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e12-month warranty from A-NAFTULY on manufacturing issues\u003c\/li\u003e\n  \u003cli\u003eCustomer support for fitment assistance and claims\u003c\/li\u003e\n  \u003cli\u003ePack includes eight iridium spark plugs for immediate installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Drivers and DIY mechanics who own V8-powered vehicles—especially Ford F-150 owners from model years 1997–2010—seeking a complete, direct-fit iridium plug set for improved ignition stability and longer service life. It’s also suited for fleet maintenance shops and technicians replacing all cylinders at once for balanced engine performance. Verify compatibility with your engine reference and year before ordering to ensure an exact match.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these plugs pre-gapped?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They are typically pre-gapped to OE specs but always verify gap before installation and adjust if necessary.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do they fit Ford F-150 2003 5.4L?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—the TR55IX (7164) set lists compatibility with 5.4L F-150 models in that year range; confirm with your engine code.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"A-NAFTULY","offers":[{"title":"Default Title","offer_id":48086155559070,"sku":"B0DD7KRSLB","price":48.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/a-naftuly-front-packaging-iridium-tr55ix.jpg?v=1785887243","url":"https:\/\/northtrailauto.ca\/products\/a-naftuly-iridium-spark-plugs-8-pack-tr55ix-7164-for-f-150-4-6l-5-4l-direct-fit-long-life","provider":"North Trail Auto","version":"1.0","type":"link"}