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Old 06-22-2013, 09:12 PM
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You can get some idea of whether a valve guide seal isn't sealing by first marking a sparkplug w/a sharpie while still installed in the head so you know the orientation of it in the head. Once you pull the plug, look at the center porcelain to see if there are oily deposits on one side only. If there is, look to see what valve it's pointing to.

A leaky intake gasket would be high on my list too.
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