When you think about it, there is a reason to pick any of the heads mentioned, depending on what your intended build is. I believe the B1bs heads have the smallest as cast chambers? The RPMs are a good standard port head, the Stealths are for a tight budget, an the Victors kind of fill a gap between the SRs and 440-1? So if you are thinking of a certain motor combo, guys could be more specific.