AFPMSL at Silicone sealer in there!

I have NEVER run a gasket there and have NEVER had a problem. The OE manifold has a nice flat surface as standard, as does the turbo, which is great. Get the AS manifold face machined flat (by someone that REALLY does know what they are doing) and you'll not have any more problems.

You using the proper Ford nuts? I use some ballistic ones on mine, they never come undone. PM me if you want the details Paul.