First off are the headbolts torque yeild(?)? And secondly since the heads are off the car are is there anything special I need to do to them? What I mean is I went into an engine builders shop and was just asking them how much a hot tanking would be but the owner of the shop went on and on about how I have to sign a wavier if I got them hot tanked since they're not going to be doing anything with the valves, something about a furnace, and blah blah blah. So is there some sort of danger of just getting the heads cleaned and putting them back on?