standard or undercut head studs?

[Boonie Buster]

What is the difference between standard and undercut stud bolts for a head?

I am looking to rebuild my old 2.0L in the dub (in preparation for some fun...:stirpot: ) And there is a choice between undercut had bolt studs or standard? is there an advantage to one for the other? Or is it just a preference?

explain :corn:

 

[skrause]

Uh, one's thinner than the other. :fawkdancesmiley:

 

[64FJ40]

I don't know, but I can google :redneck:

"Undercutting the shank of a stud increases its flexibility and spreads clamping loads more uniformly, resulting in a more consistent torque setting over many heat cycles. "