Quote Originally Posted by DirtDog View Post
.040 max. I'd stick with .035 personally.

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I know that's because they're iridium, but the copper core tr6 are recommended to be gapped at .055"-.057".

That's a nice size difference between the two plugs. Minds well stay with the copper core at .055" if I cant raise the iridiums up.

I was just tired of the short interval of the copper cores