ok, here's the deal. got low compression in 4 and 6. manual says when two side by side cylinders have low comp. there is a good chance of a blown head gasket. says to look for antifreeze in the oil. well, i can't tell by looking at the oil if there is any antifreeze in there (looks black as always /forums/images/icons/tongue.gif ) but when i opened up the radiator cap i noticed i was low. i have no coolent leaks and a brand new radiator. is there any other way to diagnose this. if all i have to do is replace the head gasket then that's great. just don't wand to tear it all apart and find bad valves/guides etc and have my work truck down. i have a spare set of heads to rebuild but wont if i don't have to. wadda yall think bout this one?