[turbo69bird]

I’ve had engines with excessive bearing clearance. From a windage tray that was dragging on my crank. It wore the bearings and I was trying to get it thought the race season I never had oil fouling of the plugs and it had zero oil pressure at idle. Similar to yours. So I don’t think that’s the issue.
I also never , ever run a PCV I plug that crap and put breathers in , on boosted applications I run a vaccum pump . But not on N/A

Again never had an oil issue like your having.
First think I’d do is plug that thing and run breathers in the valve cover see if it helps it’s cheap and easy woukd be. Logical first step

If it was a break through in porting it would show up in one or two cyls not all of them unless your porter really sucked.
All your plugs are fouling if I understand this correctly. ???


This leads me to belive it’s a systemic problem that was repeated - rings installed incorrectly , finish on cylinders done incorrectly. I’ve heard of machine shops swearing they didn’t hone right only to find yes it was in fact wrong .
Who put the ring packs on and how? Are we certain they were done correctly? But first things first block the PCV quick easy and cheap. Best of luck with it and please make sure your post back when you find out what it was could save someone alot of headaches down the road.