What is a blown manifold exhaust gasket?

A blown manifold exhaust gasket, is simple to explain. The Exhaust manifold ,are bolted to your heads. Which the exhaust pipes are connected to. There is a gasket that goes between the Header and head. What you have is that the gasket is leaking. To fix the problem you have to unbolt the manifold from the head and replace all the gaskets. Dependeing on make and model, you may have a one peice gasket or if you have individual gaskets. all you do is loosen the Mainifold and slip out the old ones and slip in the new ones. Depending on how old and rusty your Mainfold is , you might have to unbolt the Mainifold all the way off. and/of take of the exhaust pipe. But it should be simple. Hope that helps out some.