I would guess it's externally balanced. Neutral balancing will take a huge load off of the #2 and #4 main bearings. It would seem 7200 RPM on a long stroke motor with external balance is asking a lot. I used to run an external balance on my 3.625 stroke SBF. I can't remember what RPM I was shifting at back then but I know it was on the edge of what a stock crank and stock 2 bolt block was capable of. If something broke or I missed a gear it would zing it up against the rev limiter and turn either #4 or #2 main bearing. This would require teardown and line boring the block to repair and after the 3rd time the block was junk. i never scattered it because I run a system 1 filter and always check it after a race. The amount of bearing material in the filter told me it was time to tear it down.