Let me take a crack at your head stud question. In the ARP catalog, which i have in my hands right now, there are three different B-series vtec part numbers. First there is GSR with P/N 208-4304, than there is B16A with P/N 208-4601, finally there is B20B w/B16A head with P/N 208-4306. Unfortunatly there is no further info to tell the differences between them. Ive always been told that with an LS/Vtec, no matter which head, use GSR studs. That leads me to believe that required height for both would be the same. One thought, maybe the distance the stud threads into the block varies, changing the required length, but I do not know. My best guess would be that the GSR and B16 head studs are the same, but thats only a guess. Maybe someone else would care to correct my thoughts or add to this? Good luck finding more info though.