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Old 02-23-2014, 07:36 PM
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2door 2door is offline
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Join Date: Sep 2008
Location: Littleton, Colorado
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Default Re: Small bubbles at spark plug thread

I had a cylinder head with a crack in the plug threads. You couldn't see it until it turned black with oil/exhaust residue. It was a new head too and the symptoms were oil seeping from the plug threads. I never saw bubbles but I'd check the head very closely if I were you. Compression loss would be minimal but it does make for an ugly engine.

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