Banana groove small block rocker shafts

The stocker r/shaft bolts are never really tight. They are a 3/8" coarse thread bolt, same as used to bolt the intake to the heads, recommended tq for these is 45ft/lb.
The r/shaft bolt is 25 ft/lb because a hollow shaft is involved; excessive tq would distort make it. Because it is hollow, it is going to have some 'spring' in it & can never be fully tightened like the above int bolt. So I can see how fretting could occur because there could be movement.