I thought about that, the head guy did very good work, gasket matched to ports and improved flow. New valve seals, springs, the whole 9 yards and they turned out very well. Nothing was touched on the face that the intake sets against on the head. Used a strait edge on it and it’s perfectly flat on head as well as intake and the gaskets are always wet around the ports. On old gaskets you can see where the oil gets sucked up right at bottom of the ports. I’ll try to get a picture of the old gaskets if I can find them. Almost as if it’s not sealing across the bottom.
All the plugs have oil baked on them. Second set of plugs since this has been happening