[Wayne 962]

If the head is cracked you will have oil and coolant mix. Very easy to see, and you have to tear apart the engine anyway to fix the issue. Unless you think you have a crack but have no symptoms? The blocks and cylinders crack way more often than the heads, as you can see in my article on engine problems:

Pelican Porsche Tech Article - Common Engine Problems on the Porsche 911 Carrera - Porsche 996 Carrera (1998-2005), Porsche 997 Carrera (2005-2008)

-Wayne