Having a mechanic replace the blown head gasket can cost from $600.00 to $1,000.00 for parts and labor.
If the car is an expensive car that doesn't have many miles on it then it's usually worth the cost to replace the head gasket on the engine.
I had a head gasket go out on a car I bought at a used car dealership as is and I paid $8,000.00 for the car so I decided to have the head gasket replaced which costed me $1,000.00 for the parts and labor so it was worth it to me.