Main Bolt Q...
#2
I know that you want to get your block on the boring bar, but I would use the studs (which are for the final build) for machining. Different bolts/ studs apply torque differently and it will effect the final machining tolerances.
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#9
If you are align honing the mains, you would want to use the studs as the main bores will distort differently with the studs compared to bolts.
I was wondering if it would be worth torque plate honing with the studs that will be going into the motor. Run the risk of the machine shop loosing them or damaging them!