OK, blew a head gasket so i went and replaced them. Car ran like crap, kept throwing codes, ended up replacing 4 sensors (ones it would say was bad) finally it just plain ran like butt so did a compression test and Cyl 1 and 4 were real low..so off the heads come again. Well taking them in next week to have them checked, maybe somehow both end valves went bad (yeah right, like that happens) and noticed the heads have markings on them..as in yard markings..as in they have been replaced before (unless Ford started using white paint markers..lol) and started looking at they cylinder walls and guess what..cross hatch marks..looks like my engine has been redone before. I dont think its rings..hard to believe 1&4 would go out at the same time. We have like 125k on the car..put 15k on since we bought it, figgured if the rings were put in bad we would have found out a LONG time ago. I am about at the end of my rope..wondering how hard the Bull engine is to swap? its a 3.0 with the single cam with auto tranny..wonder how cheap these engines are..its driving me NUTZ!!!