[Sckxyss]

Thanks for all your replies. What's the issue of shaving the deck too much, too little material left or piston clearance. Obviously it stay outside for a long time and the pitting will compromise sealing, two cylinders are pitted too that's why it needed to be sleeved. A crack have been fixed already and the block suppose to have been pressure tested.
I don't think it have been shaved before, you can see a "M" stamped on the surface at the top of the upper cylinder and it's still very clear. I will try to measure the pitting but I will remove the remaining rust with electrolysis before.
Best regards.