Reapriete of butt bolts (Head Cylinder)

I have a question about the reappriets of the butt bolt, some tell me that it should be done between 600 to 1000km of travel. This reappriee is widespread or only does it and what happens when the torque are in degrees reappriene or only the last tightening remain.

That is only a myth ... Before that there was talk of that but by the alloys, solose one sees, if the reappriets you can twist your head or damage the screw or head of the head, some screws are of one use and should be replaced when making a serious repair in the engine ... the tightening in degrees also function and is very useful and is not very difficult ... greetings ...

Greetings
The reappriets are used only in some vehicles and this is marked by the manufacturer manuals there are many on the network some such as Ajusa, Morese indicate the torque, vehicle order, year, motor etc loosening 90 ° and pressing again at 72 lbs-pie, I reiterate before squeezing inform yourself with manual

That is what I wanted to read, I imagined something like that.
Conclusion: Everything depends on what engine is working, with its respective manual.

Thanks LT-Zeta y Ravea1011661