Have a chevy 327 in a 1968 C-10 pick up truck. Rebuilt the motor about 2 months ago. Should have about 2000 miles or so on it by now. I can detect no oil leaks anywhere. No oil seams to be on the drive way where the truck is parked at. Don,t see any leaks around the vale covers or timing cover. But I keep having to put oil in the motor. It may loose around a qt. or so in about a 100 miles. There seams to be a strange thing happening where the intake lays on the gaskets at the front of the motor. It looks as though oil is leaking though the gaskets on both sides at the front. It apears to be dark and thick, Kind of gummy. I had the thought that the PVC is pulling oil out of the vale cover into the intake. And it is leaking though the gaskets. And that maybe this is where my oil is going. I,m thinking about removeving the pvc. Now on the vale cover that does not have the PVC, There is a air vent. I,m thinking of just having two air vents and no PVC. Or should I close the air vent and only let the motor vent though the PVC? What are some ideas on this issue? Thanks, John.