If you have a stretch gauge I'd say .005"
Agreed. Bolt stretch is easy to check, and isn't a friction dependent measurement. The bolt's stretch provides the clamping force. Different thread / underhead lubricants can produce wildly varying bolt stretch at the same torque setting. In many applications an appropriate length micrometer can suffice.
Here is a sample I have of AJPE aluminum rod installation instructions, it give the manufacturers recommended assembly lube, torque, and bolt stretch. In this case, bench testing shows 95 ft/lbs on my torque wrench produces the desired stretch when lubed with 70wt Redline oil.
FYI: In the case of modern Top Fuel rods, even if you grossly over torqued them to like 200+ ft/lbs, you will break the bolt before you strip out the threads. Not something I'd try with my Golden Rods.
EDIT: Sorry, can't get the photo to orient itself upright on this page.
