From what I understand, 90% of these heads will get bolted on in house
So on paper, if something is out of spec, the assembly guy who caught it, can walk over the the QA guy who passed it, grab him by the ear and show him the mistake
This is one of the reasons these heads will likely be better quality than all other aftermarket offerings.
Warranty work is expensive, and so BPE will have far more incentive to make truly bolt-on heads out-of-the-box than any other mfg.