Well Eldrik, it's a bit of both -stock and some upgrades. Power output was stock, but she is slightly weaker now, as it's time for a rebuild. I have another block available to me, which is why I asked if you wanted a complete, running engine that needs overhaul before putting back in service. If you are not planning to rebuild, then I will not sell you this one with a good conscience. As tough as these engines are, it would probably run another several years, but it's not the correct thing to do. Keep looking!, there's one out there somewhere that's ready to mount and go.