The required bolt is .070 smaller then the stud. That is .035 per side. And the bolt has the enlarged area under the head to keep the shank in the center.
increasing the hole size .010 is only .005 per side and the stud doesn't always end up in the center after torque. Not a guarantee the passages will be left open.. Yes it will help but i wouldn't rely on it to keep the passages leading in and out of the bolt hole uncovered
