Took truck for a ride this morning and noticed temp super high. Took thermostat out and watched coolant flow through radiator. Seems to be flowing well but truck still climbing in temp. Also after removing thermostat ran truck and the pressure in upper hose was crazy high....almost like stuck thermostat but i didnt have one in there. I put new head gaskets on truck about a year ago when I did conversion but I am leaning towards bad head gasket....any ideas?