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Kaiser Forum / NOS dud plugs
« on: October 20, 2017, 09:35:44 PM »
Completing my long restoration of '53 Manhattan, I put in NOS Champion J8 plugs that I found online. Were all sealed and looked fine. After only a couple of hundred miles I have had to replace 2, and now things seem to be running rough again. One actually had a little spark going under the boot, and the other had developed quite a lot of resistance. I'm surprised that a plug could deteriorate when sealed in the original container. Has anyone else experienced this effect?