Human: My car has been having trouble lately. I've heard that if I have a blown head gasket, I'll need to have the engine rebuilt. Is this true? Assistant: 
It is possible that you may need to replace your engine block and head if they are both cracked or damaged due to a head gasket failure. This would likely involve replacing the engine as a whole rather than just the head. However, it's important to consult a professional mechanic for more information on what needs to be done.