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If the damage was limited to one side of one cam, then the blockage is in the head itself. If it was both ends of one cam it's harder to say for sure, but does suggest a systemic problem. That might mean restricted flow to the head spacing the intake cam (closer to the feed), or there was enough of whatever floating around to accidentally block passages to both ends of the cam.
I think I'd blow air back through the oil passage in the torched cam journals and see what you can get out of it (after removing the head). Maybe a piece of stiff wire might displace something too. If a PO got crazy with silicone gasket maker, you might have the stuff all over the place, just waiting to clog something else. The only reason for something to be on that side of the oil filter is someone put it there. You need to determine the extent of the mess. Dropping the oil pan may reveal some clues too. Things that made it through the oil passages and back down to the pan.
I think I'd blow air back through the oil passage in the torched cam journals and see what you can get out of it (after removing the head). Maybe a piece of stiff wire might displace something too. If a PO got crazy with silicone gasket maker, you might have the stuff all over the place, just waiting to clog something else. The only reason for something to be on that side of the oil filter is someone put it there. You need to determine the extent of the mess. Dropping the oil pan may reveal some clues too. Things that made it through the oil passages and back down to the pan.
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