Is it ok to reuse the stud and nut after they were used for around 10k ? Is there a stretch limit ? What actually causes the bolts to stretch ? Is it re-torqeing the bolt that cause stretch or just the amount of pressure on it constantly while running ? How would you measure this ?

 

Yes you can reuse them. Friends of mine have reused them at 2 or 3 times, after 3 times I would then change them, but your good to reuse them over again. I think arp makes a thread gauge for mesureing bolt stretch.

 

they do but u need access to the other side of the bolt to do that and that gauge is specifically for rod bolts, i think a head stud would be wayyy too long.

 

bump

 

i have reused them before on my supra if that helps
aluminum head steel block