4263 Spark Plug 4263/4 Copper

4263 Spark Plug 4263/4 Copper Unlock superior engine performance with the 4263 Spark Plug 4263/4 Copper. Designed for durability and efficiency, this spark plug is a must-have for those seeking reliable ignition and optimal engine function. Key Features: Copper-Glass Seal: The innovative copper-glass seal bonds the insulator, terminal post, and center electrode, ensuring a gas-tight seal that is 100% leak-proof. Multi-Rib Insulator: Engineered to minimize the risk of “flash-over,” enhancing the overall safety and reliability. One-Piece Terminal Post: Adds strength and stability, providing enhanced durability during operation. Resistor Technology: Reduces radio frequency interference (RFI) and minimizes electrode erosion for extended lifespan. Cold-Formed Steel Shell: Features precision rolled threads that facilitate secure installation and reliability. Full Copper Core Electrode: Offers superior performance in