Common Block & Head Failure Points

[DipStick]

Just tore down an overheated m42 out of my junk-yard car. The HG was blown, and I was really expecting to see either the block or the head cracked, but I cannot find anything. Are there particular areas where this head and block tend to crack due to overheating? Any insight will be appreciated!

Paul

[D. Clay]

Obvious place is usually around exhaust ports.
Thread on cylinder cracks:
http://www.m42club.com/forums/showthread.php?t=3427&highlight=head

[Shocker]

The head might have just warped and not cracked.