Thread: Spark Plug Recommendation
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Old 02-17-2009, 06:17 PM
olddog olddog is offline
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Join Date: May 2006
Location: St. Louisville, Oh
Cobra Make, Engine: A&C 67 427 cobra SB
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I just pulled Autolite plugs from my 347 (removed headers). Where the porcelan(sp?) was exposed - not covered with the plug wire, the plugs are black. Every plug is black all the way around 360^. At first I thought maybe they were leaking combustion, but it will not wipe off. Not sure what to make of it. Anyone else ever have this happen?

I think I will be putting motorcraft back in.
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