Engine trouble: Cylinder one

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I posted on the discussion forum, that GM is looking into this issue with the intake valve.
Could not get a confirmation, but I do know it is not at technical bulletin status, just a preliminary investigation, and no one would confirm, but after working in plant engineering, it sounds to me like a quality spill. In other words, X-numer of head made it past quality and testing, probably due to one of the milling machines not set-up properly.