Stefano, it really is the job of the piston supplier to give this information.
As a guess, if they are newly made modern pistons, it should be possible to put them in with 1.5 to 2 thousandths of an inch skirt clearance, but if they are older, or old-fashioned type pistons, then the clearance might need to be much more, maybe up to 4 thousandths.
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