The bike has been apart for a number of reasons, some of which I will list here. I sense you may think that I am just taking the bike apart looking for problems, but I can assure you I would rather be riding than wrenching.
The head came off the first time for a full engine rebuild.
2) The cases were split due to low oil pressure. The machine shop had ground the journals on a taper.
3) The cases were split again. The second machine shop ground the journals with excessive clearance. At this point I finally invested in some quality micrometers. I eventually found a good machinist locally, though this is really a dying trade... and dying quite literally. My crank balancer passed away a few years ago and he had been doing it his whole life. Many of the manual
machinists who are left are quite old. There has been very little interest from younger generations to pick up this trade, especially with the advent of CNC and so much outsourcing of work to China, etc.
4) Head came off another time to instal a big bore kit. At this time I invested in a second head which was rebuilt by Rob Hall at Hall's Custom Vintage in North Carolina. Nice work.
5) As mentioned earlier, there were a number of times where the gasket did not seal and leaked between cylinders.
6) The head is off now not because it leaked, but because I am unhappy with the cam change I made on the last teardown. I'm re-installing my previous set of cams because they come on cam lower in the rpm range.
I hope this satisfies your curiosity.