NGK LMAR8D-J Multi-Ground Spark Plug Description Multi-ground electrodes improve ignition capabilities and are less sensitive to increased voltage requirements due to gap growth. Designed to specific manufacturer ignition requirements, NGK's multi-ground plugs maintain all the features of their standard plugs, including: Corrugated Ribs to Prevent Flashover Pure alumina silicate ceramic insulator, providing superior strength and better heat transfer Copper core to aid in heat removal Triple seals to prevent leakage Shell Thread Diameter10mm Thread Pitch1.0mm Seat TypeGasket Reach26.5mm (1.04") Hex Size9/16" (14mm) Terminal TypeSolid Overall HeightISO Gap.031" (0.8mm) Center Electrode MaterialNickel TypeStandard Size2.5mm ProjectionProjected Ground Electrode MaterialNickel TypeMulti-Ground Quantity2 Specifications ResistorYes Resistor Value5k Ohm Heat Range8 Torque SpecsCast Iron: 7.2-10.8 lb. ft. Aluminum: 7.2-8.7 lb. ft. Part Information BrandNGK/NTK Warranty60 Days Longevity50k Miles
