NGK 2309 Iridium IX 1 Step Colder 16x Spark Plugs for 6.2 Hemi Hellcat

1 step colder than stock spark plugs for 6.2 Dodge Hemi Hellcat engines.Stock heat range is NGK 6This plugs heat range is NGK 7NGK's spark plug heat range goes from low to high and the higher numbers are colder.Recommended: Spark Plug gap in boosted applications 0.020" for moderate boost (0-15psi)High boost high horsepower 0.017"Yes the gap is low but that is to prevent detonation or breaking up without having to pulling back out all 16 spark plugs and re-gapping them. Side Note : DONT DROP THE SPARK PLUGS ON ACCIDENT, BE GENTLE NGK IX Iridium Series plugs were designed specifically for the performance enthusiast. Fine wire center electrode ensures high durability and a consistently stable spark. Iridium alloy has an extremely high melting point, perfect for today's high-tech, high performance engines. 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 leakageTechnical Specs Thread Diameter: 14mm Thread Pitch: 1.25mm Seat Type: Gasket Reach: 26.5mm (1.04") Hex Size: 5/8" (16mm) Terminal Type: Solid Overall Height: ISO Gap: 0.031" (0.8mm)