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Since they discovered the crack AFTER the machining, it would be nice of them to make some allowance in the cost of machining the second head - like don't charge you anything for the first one.
Also, I see some risk in installing the second (unknown) head without some valve work. If you are planning to keep the car for a while and you consider what a valve job would add to the already costly head replacement, it seems rather foolish to not take steps to assure good valve condition.
There's my $0.02.
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