Removing exhaust manifolds?

[Russell]

Hey guys

I gotta drop my exhaust system to do some welding on it so I can use the truck to haul some appliances tommorow, but when I was talking with my father he told me that the bolts often snap off when you go to take them out.

Is this a common problem? I pulled the manifolds off the 76's block without any problems, but I don't wanna wreck my heads trying to get the exhaust manifolds off...