K brothers have a good pic of the mod. I think the grinder with cutoff wheels is easier to handle and keep a straight line. I use the Pferd wheels, good balance between wear and cut. I just had one here that looks like it was done by a drunk guy. One of the nicest I've seen cut is Anthony's
Low Profile Oil Pan- Kudos to Nick Acton
They did a straight cut either side and a nice following of the belly underneath.
If I'm going to blow a bellhousing I want it weak on the bottom to blow out there. That way I can still stand up to push the broom and clean up the debris..........