The 036 runs great with the intake at 85 or so. I do think it's shape helps with that.....but, I've never taken the time to shorten it either. I wonder....
Here's one for y'all.
044/046 I did several years ago.
It came back to be fixed a few days ago. In the first build, I had trimmed the piston skirt to add intake duration, and it also was running a pop-up piston. There were two broken jug bolts in the base, and it was in need of a lot of parts....
We used one of the aftermarket cases that Dave sells, and while Jon was getting it ready, I was making a new piston for it. The owner loved the way this saw ran, so I was just copying the old piston, and getting it back in service. Jon already had the piston mounted before I realized that the skirt was trimmed......rather than take it back off, I just left it stock.
Tracy killed trees with it for a few days, and it started flooding. He brought it back for us to check out. He said in smaller stuff, or in soft wood, the old saw was faster...but he was in some pretty big chestnut oak.....and in big hard wood the new version was much stronger. He also reported a longer run time per tank. The only complaint he had ever had about the saw was that it was a thirsty bastard.
So, here we can see that it goes right back to giving a user what they want. Faster in small stuff, more intake duration seems to work, but in bigger wood, the shorter duration allows more torque....