Cam overlap can affect your readings, but it should still be between 3" and 7". Plugs in or out shouldn't affect the readings either if it's bad. I leave them in. If you feel like pulling them, go for it, but for a quick test, it's not necessary. Bottom line, if you suspect the intake gasket of not sealing, run this test and you'll know for sure. If you get a reading of 3" or higher, the gasket is fine and the problem lies elsewhere. I've wasted an afternoon before removing and reinstalling an intake because I thought the gasket failed, or slipped, only to discover it was fine. I was thrilled when I discovered this time saving test!!! I guess it comes with age. Time saving tips seem to mean more to me the older I get!
Take care,
-Chris
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