Genuine NGK BU8H Spark Plugs Non Resistor 6431 (6 Pack) Surface Discharge Type

NGK 6431 BU8HSurface gap plugs are nearly immune to pre-ignition, and usually require a special high energy ignition system. They can be susceptible to fouling, especially in colder applications, but may be necessary in high compression applications.Trivalent metal plating provides superior anti-corrosion and anti-seizing propertiesCorrugated ribs prevent flashoverPure alumina silicate ceramic insulator, provides superior strength and better heat transferCopper core aids in heat removalTriple seals prevent leakageShellThread Diameter: 14mmThread Pitch: 1.25mmSeat Type: GasketReach: 12.7mm (1/2")Hex Size: 13/16" (21mm)Terminal Type: SolidOverall Height: ISOGap: .016" (0.4mm)Center ElectrodeMaterial: NickelType: StandardSize: 2.5mmProjection: Non-ProjectedGround ElectrodeMaterial: NickelType: Surface DischargeSpecificationsResistor: NoResistor Value: 1K OhmHeat Range: 8Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.

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