The U-Groove Spark Plug features a patented U-groove ground electrode design that enhances ignitability, allowing for leaner fuel mixtures and improved engine efficiency. Crafted with a nickel center electrode tip and a flat seat type, it ensures reliable performance and compatibility with a wide range of vehicles, including classic and collector cars. Precision machine-rolled threads minimize the risk of seizing or cross-threading in delicate aluminum heads, making installation smooth and secure. Built to last twice as long as most conventional plugs, this spark plug delivers over 30,000 miles of dependable operation. Each plug is 100 percent pre-fired to guarantee consistent performance, making it a durable and cost-effective choice for maintaining your engine's peak 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