A crack in the engine block is my best guess.

 

Wow.. that really sucks...

did you replace the intake gasket again? did you check to see if there are any coolant and or oil passages in intake manifold. I don't think I have ever seen oil passages in an intake though

I hate to say it, but I don't think your problem is with your cylinder head.. sounds like you have a cracked block.. but at this point.. it's not diagnosisable via the internet.

We are stumped, and you are stumped..

you know your only option now... either replace the entire engine.. or send it to a shop to figure out.

Sorry our help didn't help... but we are limited.

When you find out what's going on.. please remember to post up so we will know... it's perplexing to us too