Two things and I may be wrong on both. I heard you were suspose to use oil paint to seal the ends and strip the bark off of basswood.
I have cut down two walnut trees and left the bark on, but I took it to a saw mill soon after I cut them down and cut to rough thicknesses then painted the ends. And some splitting occured.
I hope there are some other opinions out there for this topic.
Are you going to saw them up into slabs or carve them in "log" form?