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These spark plugs are suitable for use in:

• Hemi 6 215/245/265
  
• Slant 6 198/225
  
• Small Block LA 273/318/340/360
• Small Block Magnum 273/318/340/360

Please note that they feature a smaller hex than factory to ensure easy fitting in all the engine applications.

They are a direct replacement with the exact correct thread type.

NGK's Iridium IX
NGK's IX Iridium series plugs were designed specifically for the performance enthusiast

• Fine wire center electrode ensures high durability and a consistently stable spark
• 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