[Henry Schmidt]

The reason for gluing the #8 main bearing is that the cases (more often than not) are no longer completely round. Over years of use, they tend to become oblong.
This part of the case is generally not align bored (although there are over-sized bearings) so correcting this ovality is somewhat problematic.
By gluing this bearing you overcoming this inconsistency. Will it seal without glue? usually. Is there any drawback to gluing this area? not that we have seen.
We use 1211 because it tends to be slightly more elastic to deal with the expansion difference in the early mag cases.