I noticed latley that the engine developed a slight miss sepecially in the mornings so I pulled the plugs and all were fine and firing except the passenger side rear #4 plug had been accumulating some crap on the ceramic part so I'd clean it put it back in and it'd be fine till next time. Now it's gotten worse and while someone cranked it over and the plug removed,I noticed a little water coming out of the hole,not alot but enough to warrant either removing the head and replacing the head gasket, or perhaps maybe I did'nt use enough thread sealer on the ARP boltswhen I installed the heads last June.I pulled the #3 plug and it's firing good so there does'nt appear to be a leak between these two cylinders, my question is what is a good thread sealer to use on the lower bolts and do you think I could get away with just pulling the rear 2 head bolts and retighten?