Best way to flush engine after rocker arm failure?

I don't get what you're saying. "Pushed out". How could they have been pushed out and the threads still good? I think you need to do a little more investigating.

My grandson was helping me and he watched as I rotated the engine and torqued the bolts 4 times.
I agree about, my mistake, that I used the ARP bolts, They were not the correct for this application.
I am going to use the TR studs.
My only thinking is the ARP bolts are very hard and smooth finished. They did not stretch and the finish does not have enough friction to create resistance in this application.