bogus wrote:
My 92 does the exact same thing. However, my wifes 87 was tight. Call it variable build quality.

The top off is not a good idea, in my opinion. Not without the targa truss to support it.

You see, when Dave McClellan was designing the C4, he wanted to use a t-top bar. GM brass come in and say get rid of the bar. He says sure, give me $1m to fix it. They say no. He says no. They threaten his existence. He figures out a "fix" and that is the huge ass door sills. But it still wasn't enough, because the firewall cantilevers on the sills!

This is where the targa truss comes in. Well worth it in my opinion.