[Steeveedee]

Lots of good advice! My take- I've threaded a head for an individual threaded stud in the past, but that was mostly on old iron, not necessarily something that had been to the machine shop. I'll be honest and admit that I've never heard of a hot tank being too hot, but even with some raised boiling point from the lye, the tank can't be hotter than 260º, which temperature I've seen even big blocks survive, if the coolant was kept liquid. I've had mine to 230º while towing my trailer up a long hill, with no ill effects. Both metals have essentially the same thermal expansion coefficient, though, so I have reservations about that one being a stud pulling reason.