lash usually means a gap, clearance, play ,ect.
I take it you mean the head gasket. Head gaskets are pretty cheap, but the labor is high. If it is a V 6 or V8 you may have to do only one side. A lot would depend on what engine you have. I don't know if it is a car, boat or what, so it is hard to say what all is involved. You do have to remove the head from the engine to install a head gasket.
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