Spark plug NGK LTR7IX11 NGK Spark Plugs for HEMI engines from 2003 to 2008 (NON VVT) with superchargers and / turbo(S) NGK IX Iridium series spark plugs are specially designed for the performance enthusiast.Fine wire Center electrode provides high durability and a consistently stable spark.Iridium alloy has an extremely high melting point, perfect for today's high-tech, powerful engines. Trivalent metal plating provides superior anti-corrosion and anti-jamming properties Corrugated ribs prevent flashover Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer Copper core helps dissipate heat Triple seals prevent leakage Casing Wire diameter: 14 mm Thread spacing: 1.25 mm Range: 25 mm (1") < BR > Hex size: 5/8" (16 mm Terminal type: Solid Total height: ISO Hole: 0.043" (1.1 mm) Middle electrode Material: Iridium Type: Fine wire Custom: 0.6 mm Projection: Projected Earth electrode Material: Nickel Type: Standard Amount: 1 Specifications Resistance: Okay Resistance value: 5k Ohms Heat range: 7