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 hassle-free installation. Its nickel center electrode tip material and flat seat type provide reliable performance across a wide range of applications, including classic and collector cars. Designed to last twice as long as most conventional plugs, this spark plug delivers durability and value, with a lifespan exceeding 30,000 miles. Each plug is 100 percent pre-fired to guarantee dependable operation, making it an excellent choice for maintaining OE performance in your vehicle.

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