GN1's and E85, I was running the NGK R5671A-7 gapped at 0.32 which is a hot plug, my boost was 20lbs and I had no issues, idled fine and ran clean, but I was told that the colder the plug the better so I put the NGK R5671A-9 in gapped at .028. Haven't had a chance to get on it yet, but it idles fine and drives cleanly. I figured I better put the colder plug in before turning up the boost.
Regards,
Shev