headbolts? 911 2,7l
 

Hi
Im new to this forum and hope someone can help.
I have just bought a 911 from 1975 and i have to change the haedbolts and gaskets, has anyone a tip where i can get these parts(i have the bolts allready)
And second, how much power do you hva to use when tightening thes bolts? (Nm, drehmoment)?

ekskuse my poor english