While you wait for someone who knows more than me to reply, check out Hoffman Machine's web page. There's some good info about cracked heads and repairs. https://hamheads.com/2017/01/16/986-996-porsche-cylinderhead-cracks-explained/
I'm not saying it's not the head gasket. I just know that cracked heads are a much more common cause in these cars.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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