IZFR6N-E Spark Plug (86-4757) offers enhanced ignitability increased throttle response and superior anti-fouling for the performance enthusiast. IZFR6N-E Spark Plug (86-4757) The 0.6-millimeter laser welded tiny Iridium tip assures long-term endurance and a constant spark while the tapered ground electrode reduces the influence of electrical quenching. A longer insulator nose prevents fouling corrugated ribs on the insulator prevent flashover and a triple gasket seal prevents combustion gas leakage. IZFR6N-E Spark Plug (86-4757) has a high melting point making it heat and electrical wear-resistant making it ideal for today s high-performance engines. Key features: Anti-corrosion and anti-seizing capabilities are enhanced by trivalent metal plating. Flashover is prevented by corrugated ribs. Isolator made of pure alumina silicate ceramic which has outstanding strength and heat transfer. The copper core aids in heat dissipation. Leakage is prevented by triple seals. The use of ultrafine wires improves ignitability and performance. Specifications: SKU: 86-4757 UPC: 087295047576 Weight: 0.15 LBS