[sts]

I know my way around glass pretty well, but I have trouble understanding what you mean. Can you post a picture or give more detail?

[65Mark]

If you are talking about an A body car and the A pillar "cover", that "hole" or gap at the corner of the windshield where the "cover" doesn't lap over the channel. That should remain open for water drainage from the windshield channel. Hope that is what you are talking about.

[400 4spd.]

Originally Posted by 65Mark

If you are talking about an A body car and the A pillar "cover", that "hole" or gap at the corner of the windshield where the "cover" doesn't lap over the channel. That should remain open for water drainage from the windshield channel. Hope that is what you are talking about.

That's how I understand the question. And yes, it should remain open. The cover should be sealed to the pillar at the top joint and with strip caulk along the flange that the attaching screws go through.