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Just as a warning, almost ALL 6.2 heads show some cracking. You might wanna carry on some discussion on www.dieselplace.com too.

ugh... I agree with your head gasket theory... but additionally its possible that you could have some bearing issues, if you have any coolant in your oil. I would suggest having the heads checked for cracks, and maybe even flatness. This is exactly why I have a temp gauge for mine...