![United-States Country flag](https://opeforum.com/data/files/flags/shiny/32/United-States.png)
I think if you use the 42 piston the difference is the skirt length242 on the wheel:
Stock timing with gasket:
IN 62.5°
TR 127°
EX 111.5°
To make sure I'm not off the timing I gone reset the wheel a few more times, gone use something thinner then a piston ring...
View attachment 31969
Gotta pay a bit more attention to this area when I remove the gasket in the future....
View attachment 31970
With the non windowed piston the case is smaller and they give it less intake duration. Why not try knocking 1mm off the skirt (don't forget a nice chamfer) see how it runs with the extra case compression.