You need to use some type lubrication on the bolts/studs because the metal on metal will "stick" and give you a higher torque reading than it really is.
This is one of the worst conditions for any bolt or stud. Apart from a possibly blowing a head gasket due to too lower a torque, you cycle stretch the bolt/stud, which will make them fail quickly.
To explain, there are a few concepts you need to understand.
1. Bolts/studs have an elastic and plastic range.
a. The elastic range is where the bolt/stud will recover it's original dimensions.
b. The plastic range is where the bolt/stud is deformed and won't return to its' original dimensions or strength.
2. If a bolt/stud remains in its' elastic range, but it is being repetitively stretched within the elastic range, it will fatigue and fail.
3. If a bolt/stud is stretched outside its' elastic range, its' maximum strength is compromised.
With this information, you need to torque up a bolt/stud until the total of the initial torque, and expected load, don't exceed the elastic range.
Also, you want the bolt/stud to be within the elastic range, but not being further stretched by the external loading.
To try and simplify what I just wrote...
a. Bolt
can will remain in its' elastic range up to 200 foot pounds.
b. Expected external repetitive load is 80 foot pounds.
c. At 100 foot pounds, the bolt will not stretch with an 80 foot pound load.
<<<<<< THEREFORE >>>>>>>
If you try to torque the bolt down to 210 foot pounds, it will get to the 200 foot pounds and then stretch into the plastic range, lose strength and break.
If you torque the bolt down over 121 foot pounds, but less than 200 foot pounds, the external load of 80 foot pounds will stretch the bolt into its' plastic range and it will lose strength and break.
If you torque the bolt down to less than 100 foot pounds, the external load of 80 foot pounds will cause the bolt to stretch within the plastic range, causing the bolt to fatigue and fail.
If you torque the bolt down between 101 and 119 foot pounds,
1) The bolt will not stretch.
2) The bolt won't lose its' strength.
Hope this helps.
Cheers.