One of the bolt that holds the Exhaust Manifold snapped while tightening it. What are the chances that this will leak?

The bolt in question is the last one to the right, bottom.

I already put some Permatex copper thing there just as a precaution but I doubt that it will help.

Does anybody know any sealant that can withstand high heat? The permatex copper only is good for 700F.

 

If it leaks, you'll have to extract it out. If you don't know what you're doing then I suggest someone who knows what they are doing to help you out.

 

that goop wolnt last, it may leak but just a small amount