NGK 4495 BPZ8H-N-10 V-Power Spark Plug NGK V-Power plugs feature a unique v-cut in the center electrode that directs the spark to the edge of the electrode, helping the spark develop more rapidly, increasing ignitability and reducing quenching. Trivalent metal plating provides superior anti-corrosion and anti-seizing properties Corrugated ribs prevent flashover Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer Copper core aids in heat removal Triple seals prevent leakage Product Specifications Shell Thread Diameter14mm Thread Pitch1.25mm Seat Type Gasket Reach12.7mm (1/2") Hex Size13/16" (21mm) Terminal Type Solid Overall Height JIS Gap.039" (1.0mm) Center Electrode Material Nickel Type V-Cut Size2.5mm Projection Projected Ground Electrode Material Nickel Type Standard Quantity1 Specifications Resistor Yes Resistor Type Inductive Resistor Value35 Ohms Heat Range8 Features Strengthened Ground Electrode Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.