4054 Spark Plug 4054/4 Copper

4054 Spark Plug 4054/4 Copper Experience superior performance and reliability with the 4054 Spark Plug 4054/4 Copper. Designed for those who demand excellence, this spark plug combines innovative technology with robust construction to ensure optimal engine functionality. Key Features: Copper-Glass Seal: The unique copper-glass seal effectively bonds the insulator, terminal post, and center electrode, ensuring a gas-tight seal that is 100% leak-proof. Multi-Rib Insulator: This advanced design significantly reduces the risk of "flash-over," promoting safer and more efficient engine operation. One-Piece Terminal Post: Enhanced strength and durability through a robust one-piece terminal post construction. Resistor for RFI Reduction: Built-in resistor minimizes radio frequency interference (RFI) and decreases electrode erosion, leading to longer-lasting performance. Cold-Formed Steel Shell: Precision rolled threads on a col