2019 summer race.... Jadaharabi vs 318willrun

I'll need 4. Both heads. I'm suspect now of their junk. Wonder what quality of valves they used? break a valve and drop a head into a cylinder at 6k rpm's?
Maybe somebody else here has used these and can give a testimony. Perhaps I'll start a thread and seeā€¦...
.
Call them. I don't want you sending me junk heads.