The U-Groove Spark Plug features a patented U-groove ground electrode design that enhances ignitability, allowing it to fire leaner fuel mixtures for improved engine efficiency. Built with precision machine-rolled threads, it minimizes the risk of seizing or cross-threading in delicate aluminum heads, ensuring a secure and hassle-free installation. Designed for versatility, it offers compatibility with a wide range of vehicles, including classic and collector cars. Crafted with a nickel center electrode tip and a flat seat type, this spark plug delivers reliable performance and durability, lasting over 30,000 miles - twice as long as most conventional plugs. Each plug is 100% pre-fired to guarantee dependable operation, making it a long-lasting and cost-effective choice for maintaining optimal engine performance.

Product Features:

• Patented U-groove ground electrode design fires leaner mixtures than conventional plugs
• Precision machine-rolled threads reduce seizing and cross-threading in delicate aluminum heads
• Wide range of part numbers for thousands of applications, including classic and collector cars
• Lasts twice as long as most conventional plugs
• 100 percent pre-fired to assure reliable operation
• U-Groove Conventional
• Long-Lasting Durability: Lasts over 30,000 miles, twice as long as most conventional spark plugs, providing extended performance and reliability.