I looked through all the TEK titles and skimmed some of the anchorage reports and I didn't find any reference to un-grouted through bolts. I see this type of connection regularly in the field but don't have any idea how to define an allowable load.
Why dont you want to use Hilti HY 20 for hollow concrete block? The tension and shear capacities are explicitly given in a Hilti product guide. I know some are concerned about using such anchors, but I use them all the time. They have been performing just fine.
