[s-cars] Are all Audi AAN heads cracked?

[chris chambers]

Gentz,

I have a friend searching for a good uncracked AAN head.
He just found out that the head he had purchased that was described as havin been
rebuilt ~10,000 miles; has cracks in all 5 cylinders, with multiple cracks in 2,3 & 5. 

So my questions are: 

1. Do all of these AAN heads have cracks and we simply live with them or is he just having a hard time?

2.I have an unmolested stock engine (car wasn't chipped) that runs well, if I pull the head off that for him
is it likely that I will discover it has cracks in it's head. 

3. What is the best way to check a running engine for cracks in the head?


Regards
Chris