Puffwagon Gold Donating Members 16,348 Member For: 10y 3m 16d Gender: Not Telling Posted 05/04/21 10:36 AM Share Posted 05/04/21 10:36 AM (edited) They were working fine on e85 at 500 and completely farked at 550. So I'd say 500ish. Edit: results will vary lol There are reasons for not gapping plugs but if it boils down to "does it matter", the answer is no. Edited 05/04/21 10:37 AM by Puffwagon Why not? 1 Link to comment https://www.fordxr6turbo.com/forum/topic/67782-which-spark-plugs-are-better/page/3/#findComment-1703877 Share on other sites More sharing options...
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