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Good point. I have neve had it done, but understand that sniffing for combusition products is SOP.
Another thought is a pressure test on the cooling system, with the engine both cold and hot. A good chance if there is a crack, this would be evident as slow leakdown on the coolant system pressure.
Maybe it is a part of an overall system check-over of the coolant syatem, ie pressure test, flush, operational check, gas detection.
It also comes back to the problem that started this all off - ie blown head gasket and ruptured radiator tank. There is a distinct possibility that there is an underlying issue with the block/head that only becomes apparent under certain conditions.
Wolfgang
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