Aluminum Intakes dont seal on X heads

have you looked at your bolt hole alignment? I'm assuming you don't have alignment issues because the bolts go in all the manifolds you have tried. You never mentioned what you are using to seal the intakes without the gaskets. Edelbrock does not recommend the cork gaskets, in fact their installation instructions tell you to toss them and use a bead of rtv across the front and back. You have to make sure the bead is thick enough to seal and give it time to cure. I would take the bolts out and do a test fit like they mentioned in a previous post. Also when you say "port" are you talking about the gaps in the front and back? Where is the oil coming from to pull it in?