I hope mate, I just want to make 100% sure before I block the card. From what I have read MSI do allow cooler removal but nothing is stated in their warranty.
Well unless it has changed with MSI
MSI UK's Facebook post regarding waterblocks and stock cooler removal
https://www.facebook.com/msiuk/posts/652634514773229
To be clear to those people wanting to install a GPU Waterblock on their MSI Graphics Cards...
In the EU (UK incl) if you install a Waterblock it will NOT void your warranty so long as you don't damage the Cooler or PCB in any way.
I would suggest to keep the cooler (and screws used) kept safe somewhere if you ever wanted to RMA the card to us or the place of purchase to keep your warranty intact