Right.
I understand what you are saying. After things warm up and cool, things will settle, so re-torquing is necessary. That makes sense, and I trust your experience to be right on the money, for sure. However, a lot of the problems people, including myself have experienced don't fall into that category. The puch head that you run has much better cooling than the stock heads. And although the combustion chamber dimensions are not ideal for these motors, that head offers a significant improvement over the stock head. The stock heads not only have no squish band, but they have limited cooling. The combination of those two factors make the stock engine susceptible to detonation (especially the PK-80), which then, as you probably know will cause a severe increase in engine temperature. Since aluminum has a significantly higher coefficient of expansion in comparison to the steel studs, the the top and bottom gaskets will get squashed in these conditions. This is why some people have this never ending problem with studs and nuts, not to mention the serious engine damage also associated with a detonating engine. Even adding a simple "banana" style exhaust on a PK-80 can put it over the edge, falling into detonation territory, which will then lead to numerous engine problems. This was my experience. And when I started fitting "Fred Heads" onto my bike engines, all those problems simply went away. Just ask Dave from Arrow. His bikes have been excelling in the bicycle races, and since running Fred Heads, his engines are lasting for the whole race season.
You sound like a very skilled mechanic. I appreciate your input. And it sounds like you have done a nice job with your engine.
Thanks
-Fred