Hello Fellow forum members. This the first time I have posted a message on any message board. I have not posted before now (I have been a member for 46 days) because I was observing the posting rules and was just searching the site for answers to my questions. I may post soon as I suspect I have the dreaded BHG::bhg::. I did perform the block test and the result was negative (no exhaust gases in the radiator). I guess I will just re-torque the head and pray my overflowing overflow bottle is not a indicative of a BHG but is in fact some other coolant system problem.