z/OS 1.8 changed a lot of things in this area. Page replacement, UIC calculation and updating, no more physical swaps of ASIDs to AUX storage to name a few. So I'm not surprised you don't see blocked paging without the physical swaps.
There hasn't been alot of detail published about the z/OS 1.8 changes, but it seems that the changes in UIC (as well as the change to global management) would preclude block paging functions. If I recall, the concept of block paging involved stealing pages from within an address space that shared the same UIC value. Both of these concepts no longer exist (in that form), so it would seem that without some other change being indicated, block paging would no longer function as previously.
Adam
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