Adding studs for main caps
I was just going to ask that question
They CAN distort the bore differently than a bolt will. You can’t feel it with your finger but you can easily see it with a bore gauge.
The other issue is the stud is way less forgiving as far as being off axis (perpendicular in all planes to the block) than a bolt is. The bolt holes are often drilled and tapped crooked and with a bolt it’s not a big deal.
Most main studs are not undercut like the bolts are, so if the holes in the block aren’t perfect (who says the hole in the cap is correct??) you can end up with the stud binding in the hole when you put the cap on.
Some guys just get out the BFH and beat the cap into the registers, but that will certainly distort the bearing bore.
If you are going to install main studs you should at least make sure the stud doesn’t bind in the cap and measure the hole with a bore gauge to make sure it’s still round.
