Heating the stud to cherry red and quenching shrinks the metal ! I've done this when working sheet metal, nice trick Synchro, Thanks for the tip!
Heating and quenching can work good for shrinking sheet metal body parts. Heating and quenching hardenes metal and can make metal brittle. Head studs are pretty easy to break even if not heated and quenched . No harm meant , I just hope that you don't have the bad luck of wringing off a hardened stud in the block .