Iridium plugs have an extremely long life as Iridium is 6x harder and8x stronger than platinum. Because of the strength and hardness ofiridium, there is virtually no electrode wear. This combined with aplatinum ground electrode, creates a spark plug that is almostimpervious to wear even under extreme driving or racing conditions.

Part SKJ20CR-A8 superseded to 3371
Gap 0.044, Stock# 3371 ; Patented Iridium Alloy Plug (90% Ir)
w/Platinum Ground Strap ; Natural, Eng Code: D16Y8 ; 4 Per Veh