Took the head to the machine shop today to get it hot tanked and then to my retired machinist's house where we took it apart and inspected it. A couple of valves had some pitting on the seats and the exhaust valve on the really bad cylinder had a tiny piece of carbon on the seat that was apparently preventing it from closing all the way, all of this was caused by the improper valve adjustment with zero clearance. I cleaned the valves up on a spinning wire wheel and he sent me home with some lapping compound to lap all of the valves tomorrow.
If any of them do not lap in completely, I will replace that valve with a new one. The seats in the head look fine. Like I said before, you really do not want to cut them on these heads. I will of course replace the head gasket and possibly the head bolts if they do not check out. More to follow.
