I'm going to say no, not with that thick of a radiator.
If you look at a O11 with the vertical mount installed:
https://pcpartpicker.com/b/gW3Zxr
You can see that the PCI slot covers that are obstructed at the bottom include the bottom most slot (by the fans) and the second to bottom slot slightly obstructed by the vertical mount frame. PCI slot covers are 18mm thick.
18mm +18mm +25mm = 61mm, you are a further 18mm more than that needed and there is even less space than that since those slot covers are covered a bit. (Though that might account for the small gap between slot covers, still not enough)