Stop in for a cup of coffee

halifaxhops said
Eric, No idea what happened to that plug. Was it hit on grease going in and burned most of it off? New one on me.

No, he has changed the plugs (tried hotter to burn it off), swapped wires and distributor caps. Strange for it to only be right on the electrode and ground strap. If oil I would think it would be covering the plug more, but it is super clean.