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Work had been crazy the last couple of months so It took me awhile to put it back together. I held off on the head gasket as suggested. So tonight I fired it up, started the purge process on the coolant. Everything was going fine until I turned the heat on. That’s when I heard what sounded like a light popping sound with gulping coming from the lower radiator hose. I figured that was the air purging from the radiator. Not long after the engine started to change pitch. I turned it off checked the oil and bone dry I had just changed the oil prior to starting it up. What I found was all that oil ended up in the radiator. So I pulled the upper and lower intake manifold off and there was no oil in the valley or antifreeze. I replaced the oil filter housing for an aluminum one (not Dorman) an Amazon off brand one. Is it possible that the seals aren’t making a seal allowing the oil to cross over to the coolant? If that is possible wouldn’t I see some evidence in the valley?