yeah I've heard people that have heard horror stories, but that's what I started the thread for to confirm any and there was none..
I would have to question someone's brains if they didn't at least pull the valves out and make sure everything was clean and relube ocated before they were put into service at the very least... And if by some way or Reason you couldn't see sand in the water jackets I still can't see that blowing up an engine unless they were completely clogged which again would come through and just an easy Blow by test..
the only place I called to see about any work wanted to put all brand new seats and because they'd heard their horror stories as well and wanted to do all new valves and valve job and they quoted me something like $800 LOL.. I thank them for their time and answering my questions...