[–] Germ22 [S] ago 

Cylinder head bolts are often stretch bolts and are a one time use bolt.

Steels have a tension force, stretch and return to it's original length. But to call it a spring, i think that's a bit of a ... stretch.

[–] RubberHead 0 points 1 point (+1|-0) ago  (edited ago)

yup, it is a spring system

stretch

then you agree with me

[–] Germ22 [S] ago 

Yes absolutely

[–] RubberHead ago 

i think that's a bit of a ... stretch.

then why can you break a bolt if you get on it to much, im not lying... search about it

[–] Germ22 [S] ago 

You can rip apart a tension spring if you pull on it to hard.