NGK Iridium IX LFR7AIX Spark Plugs (Set of 16) 2309 5.7 Eagle and 6.2 Hemi Heat Range 7

These NGK Iridium IX spark plugs feature an ultra-fine center electrode that's designed just thick enough to ensure the maximum durability and life of the spark plugs, and just thin enough to create an accurate and consistent spark. They represent the ultimate evolution of spark plug technology and performance. Iridium is significantly stronger than any metal used in spark plugs today. It's the hardest metal used (in fact, iridium is 6 times harder than platinum), which has allowed NGK engineers to reduce the voltage requirement for a spark. Features: Shorty Spark Plug: No Resistor: Yes Manufacturer Heat Range: 7 Electrode Core Material: Copper Electrode Tip Material: Iridium Insulator Type: Projected Spark Plug Thread Size: 14mm Spark Plug Reach: 1.043 in. Spark Plug Seat Style: Gasket Wrench Diameter: 5/8 in.  NGK Part Number: LFR7AIX Recommended Gap Size vs Boost with factory HEMI coilpacks: 0.029" for stock boost level 0.027" for 15psi 0.024" for 18 psi 0.022" for 20psi 0.020" for 22psi 0.018" for 24psi  NOTE: Use of nitrous with boost may require smaller plug gaps.