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scicala · 04-21-2021, 10:41 AM

If a plug doesn't fire one time, then on the next compression stroke there is still a little residual fuel in the cylinder the next time a fuel/air charge comes in. In that case, black plugs make sense to me.

Sal

04-21-2021, 10:41 AM	#23
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,706	Re: Flathead Running rich If a plug doesn't fire one time, then on the next compression stroke there is still a little residual fuel in the cylinder the next time a fuel/air charge comes in. In that case, black plugs make sense to me. Sal