OK, I see how the post got split. My answer would be NO. The potential of a seat coming out keeps me up at night. The heads would have to be free. Then I would remove all the seats and replace them with ones with enough press. Catastrophic complete destruction of the engine is the only result I have seen from a seat coming out of a running engine. Only one time did I have a seat come out while an engine was parked. It was a Jeep Liberty 3.7L. A seat came out while parked and when restarted made a horrible racket when cranked to start. Caught it and pulled the head and fixed it with minimal damage. Only time I ever got lucky with a valve seat.
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