Where do these intake bolts like to break off? Up by the head or lower, where the threads start? I have been soaking the bolts since last week, with PB and DeepCreep, so far, the 3 that I can get to without disassembling anything, only one broke loose and turns nicely, the other two, don't feel like they want to move, if I put any more torque on them, something might break.
I am thinking, that if the heads break off, I can still grab the shank with a locking pliers and remove the stubs that way, once the intake is off.
Is there something else I could soak the bolts down with? PB and Deepcreep are the best I have, Yield was great stuff, but don't have anymore.