Hey I remembered to check back!
I just tried out my Nikkor UD 20mm f/3.5, N.C 28mm f/2, S.C 55mm f/1.2, P 105mm f/2.5 (early Sonnar, 9 bladed aperture), and Q.C 135mm f/2.8 and all of them mount fine. A little snug, maybe, but mount, unmount, and working on the Z8 just fine. All of these lenses have
not been Ai converted, and I only have the FTZ original.
Before trying I was initially worried about the 55mm f/1.2 because I know for sure it's incompatible with the F4 (and possibly other cameras) due to rear clearance, but all seems well.
This sent me down a bit of a rabbit hole, because if my old 105mm and 55mm mounted I thought anything would.
I'm not a Nikon historian, but I do know that lenses measured in centimeters instead of millimeters are among the oldest around.
I checked the forum for info, and not much doing. Then I searched for
Nikon's FTZ Compatibility guide , and the page acts as if Pre-Ai lenses don't exist? ... I almost stop there, but I think if anywhere is going to have the specific lenses not compatible with the FTZ, it's going to have to be in the PDF. Purusing through it, I find the incompatibility list on page 15 of 16 pages.
So, first row first column, it claims
all Non-Ai lenses aren't compatible.... which is not correct.... but then it proceeds to get to a few of the other lenses that are non-Ai and are quite old. Who knows, I don't own anything that's specifically named so perhaps that much is accurate. Figured I'd publish my findings on here in hopes it might help someone else in the future.