Re torqueing head studs/bolts

I imagine anyone who turns a wrench will find this interesting. I'm interested in hear what AndyF and other knowledgeable professional builders or aircraft mechanics/machinists think.

I understand the concern about loosening the bolt or nut too much. I've often backed off a nut or bolt a small yet effective enough amount like a 1/8 turn or less to maintain some high percentage of the installed torque that still allows for a smooth re-torqueing of the item back up to spec without having to overcome the break-away torque.

I think the key is not to over loosen the fastener. Perhaps, a simple test using a rod bolt, a torque wrench and a micrometer to measure the change in length during the process would be enlightening.

Now, the real question. Did you follow the same procedure on the head AND main bolts before you bored and finish honed your bores.

I just read Krazycuda's response as I was typing this. He's on track. Temperature also plays a role to some degree. Dough!