What does a bad head gasket do?

[Technical_Automan]

My head gasket is bad, I know because when I turn the car off, coolant is coming out right where the intake manifold connects to the block. So what problems would that cause performance wise?

[Jm93]

actually your intake manifold doesnt really connect to the block, it is bolted to your heads, and it sits ontop of the block. a good idea to go through and put nex gaskets it, get the heads cleaned up, chanck the valves, intake refinished and so on while your at it.

[86TATpi]

It could blow the engine. Antifreeze in oil doesn't make a really good lubricant for bearing in the bottom end.