I wouldnt go as far as to say replace them everytime you remove the head. Someone could have just bought new head bolts and have to remove the head, this doesnt mean they need new ones. Then again, if you are taking the head off for the first time Ide assume that the head bolts in question would be the ones originally installed on the car. Then I would say yes, replace them with OEM, or ARP studs. Typically when head bolts stretch, it is a HIGH boost application, such as 25psi or more. This doesnt mean that they wont stretch over time, but I would say a heck of a lot less prone.
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