Cracked head somewhere...

[toseland]

so i am leaning more and more to a small crack opening up in my cylinder head somewhere...


inflated coolant lines (hard but not too hard) and when reved i get foam in me coolant expansion tank




however, how much cavitation does the pump cause as its coming from the return line from the pump and is most apparent when its hot (only when its hot) and the thermostat is open...


any ideas?

i am guessing someone could have a poke at pugfest and identify it for me/confirm or deny my fears so to speak.