The U-Groove Spark Plug is engineered for optimal performance and durability, featuring a patented U-groove ground electrode design that enhances ignitability and supports leaner fuel mixtures for improved engine efficiency. Its precision machine-rolled threads minimize the risk of seizing or cross-threading, making it ideal for use in delicate aluminum heads. Built with a nickel center electrode tip and a flat seat type, this spark plug ensures reliable operation and compatibility with a wide range of vehicles, including classic and collector cars. Pre-fired for consistent performance and lasting twice as long as most conventional plugs, it delivers exceptional value and longevity. Whether you're maintaining a daily driver or restoring a vintage vehicle, this spark plug is a dependable choice for OE performance and extended lifespan.

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