NGK IRIDIUM IX Spark Plugs 6509 (Pre-Gapped) - 2011-2017 F150 5.0L

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IRIDIUM IX (LTR6IX-11) 6509 ULTIMATE PERFORMANCE FOR 2011-2017 5.0L Designed specifically for the performance enthusiast, Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling. Set of 8 Pre-gapped to .044" Fine iridium tip ensures high durability and a consistently stable spark. Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines. Trivalent metal plating provides superior anti-corrosion and anti-seizing properties. Tapered ground electrode increases ignitability and minimizes quenching. High-grade alumina silicate ceramic creates a stronger insulator to reduce dielectric punch-through (caused by spark exiting through side of ceramic). Cold-rolled threads prevent cross-threading and damage to cylinder heads. Outstanding acceleration, high fuel efficiency and durability. Ultimate design, technology and performance. Heat range 6. Show more