Well, it certainly could be a head gasket, or a cracked head.
But that should have been the first thing your mechanic checked and eliminated.
The engine would only loose power if it is real bad.
And it would not blow smoke, only steam like when you first start up on a cold day.
1. Check for water in your oil. (Oil goes milky like creamed honey).
2 Remove radiator cap and run engine at idle, revving up and down a bit as you watch water in radiator.
If the oil is milky, or you see bubbles, or water squirts out, then the head or gasket is gone.
Good luck.
PK





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