It makes me feel bad when someone gets no response for help with something that is really important. I guess you need to upgrade something to get any help.

First, I would not pull the heads and think the worst. Check your water pump and hoses. I know they are not in the back, but so many times people just want to assume the worst. Even a leaky water pump can have water blown onto the heads and run all the way back and leak. Some times you cant find the trail of water because the heads get so hot it evaporats before you can see it. Look for discoloration of trails from your pump to the place where you see the water. Follow it backwards and forwards to the front and rear. Look for any suspicouse marks, trails or discoloration. Good luck and let us know what you find.