Head Gasket test questions
A little background on the truck, it's a 07 F250 with almost 78k miles with either the looney tune, or Innovative's Xtreme race in it since 2k miles. This past summer I had 2 puking/coolant loss episodes but everything else has behaved normally and there haven't been any other problems so I just left it alone. I decided today to connect a pressure gauge to the degas bottle to see what would it would read. I want to report my findings to see if this is normal as I know what is supposed to happen if there is a problem but I'm not sure how it's supposed to act if everything is okay. The gauge stayed at zero for about five minutes of idling. Then didn't rise during a minute or two of easy driving. Only after I started beating on it did the pressure slowly rise. After ten minutes of going full throttle both from a stop and while rolling the pressure barely reached 14 psi. After my last run I drove around for another 5 minutes and the pressure dropped to around 11-12psi where it stayed until the end of my drive and another 5 minutes of idling. I used a decent quality pressure gauge so the readings should be pretty accurate. Does this sound accurate for a truck with head gaskets that are not blown? Please let me know your thoughts.