carrllio rods need tech info

hi all i am after some tech info for the rods i am useing
they have carr bolts i have been told to tighten them to 45foot pounds then check strech no more then 6 thou
but what is the standed lenth of the bolt i just want to do it the right way any info very helpful😀😀

Type of lube varies tesion reqd to get max stretch . Under head & on thread. Bolt must come back to orig length when undone.Get new bolts if history unknown. About $50 ea!! Instructions with new bolts