Spark Plug Gap GS300
#4
Pole Position
In my experience, the NGK Iridiums have always had the correct gap right out of the box.
Chip H.
Chip H.
#5
Pole Position
This, and the electrode is very hard and brittle on iridium plugs, they are not recommended to be manually gapped as you can easily crack the electrode. And they should already be the right gap, lol.
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