I have another theory for you to check. Another inliner pointed this out to me. See if you PCV is passing oil into the intake manifold. It can than track into a certain port and pollute that cylinder and show up tracking out the intake port.

Last edited by tlowe #1716; 04/24/16 10:16 AM.
Inliner Member 1716
65 Chevelle Wagon and 41 Hudson Pickup
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