Went to remove the heat shield that's bolted on top of my manifold and the head completely sheared right off. I think who ever put the shield on didn't put the bolt in completely straight (wasnt me) and this caused it to shear off when I was trying to remove the heat shield. Do I have anything to worry about since the screw is still in the top of the manifold or will it be ok? I dont want the thing to fall through inside at some point and then get blown through the turbo.

 

There should not be a hole there. The bolt hole should not go all the way through to the inside of the manifold. So you'll be fine.

 

You'll be fine. Heat shield bolts break frequently. The heat cycling both weakens them and causes the dissimilar metals to seize.