Is it possible that these are "torque to yield " studs. I know that most
modern engines use that type. I have a large gap in such experience with
head bolts, I know that in the 60s and before they always provided torque
specs but when working on a 1985 engine I learned of "torque to yield " head
bolts. These must only be used once, and there is a specific instruction in
the manuals for them.
If you are sure that this is not the case, look in the front of any Haynes
manual and you will find a list of torque specs for bolts according to their
size. Do not exceed this as you will weaken the bolt.
George
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