well all back together and still the same problem...
the water is boiling in the head but not in the block... seems like a blockage but its been all flushed...
thermostat was suggested but its brand new... i'm gonna gut my old one and put that in see if it fixes the boiling...
what i really need is to see another 4e so i can have a look at how ALL the water lines go. and compare to mine.. perhaps i have something plumbed wrong.