I might have to agree with you, on that the sealer is leaking, though any angle on the seal would cause a leak. A couple of questions. Did you do a pristine job of cleaning the mating surfaces? Were there any nicks in those edges that should have been smoothed out? Was the sealant OEM or an aftermarket? Or could it be that there is too much sealer there and those return holes are clogged with sealant? Try to push a wire into the spaces. Did all of the bolts torque down? Those 10mm fine thread bolts do not take any over tightening, and the treads in the holes last for only a few cycles.

I think your only resort is to have the seal replaced with the tool to rule out seal seating, then if it still leaks, pull the head top, reclean, repair any bolt holes and re seal. Sorry, thats pain, and not what you want to hear.

DanR '94 964 336,000 miles (102,000 on the new engine)
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DanR