Hey guys just the the topics says....

How can i tell if i have a blown headgasket or cracked cylinder head?

I have performed a leak down test which was 8% on all cylinders and also a compression test of 270 on all cylinders. Which showed no sign of a blown headgasket. But i have alot of air going into my cooling system and i wanted to know if there was a test i could perform which would prove which of the 2 the air is comming from. Thanks !