Cummins reman cm871 worth it?

[windowrattler]

The last two we have done have had valve train failures in the rocker shaft assemblies. I also worry about cylinder protrusion especially with cummins lowing their spec down 2 thousandths. To throw another wrench at you we are becoming leary on the reman heads also. They seem to have early failures with cracking. Just my observations over the last couple years.