Are flywheel bolt holes made to lock the bolt in?

[davepl]

I was test fitting some 3/8 Grade 8 bolts to bolt the pressure plate to my flywheel, and I found that, from either direction, the bolt makes it about half way and then you can't turn it by hand anymore.

I found this in multiple (all of the) holes, and I hate forcing fasteners.

I'm wondering if this is a "design feature" to help retain the bolts, like a lock-nut built into the flywheel? Anyone run into it before?

This is on a newer GM replacement flywheel, not a vintage piece.

Thanks,
Dave