I thought there might be some sapwood under the burl but I bandsawed a thin piece off the side and the sapwood ends where the burl begins. It looks like the heartwood got an infection and boiled up through the sapwood, if you can picture that. I don't think I will use any of that section. I will try to split off the one side(right side first picture) because even if it goes wrong there is lots of wood in the 43" section for two billets.