[Raptor]

You don't need to go to 105 on the head studs. On motors that are not torque plated to that spec, you are making an OOR condition with the cylinder. We typically have them torque plated at 100 and of course set them to that when building them. The ARP studs will stretch at not much above 105. Pistons usually prefer round holes. That of course has nothing to do with the problems you are dealing with, just something to think about for future reference.