Shineray 200XYI: impossible to remove valve cover?

[thedakotakid]

Judging by how impossible it seems to remove the valve cover, I am guessing no one has adjusted the valves since new. The problem is the clearance between the frame and the head. I got so desperate I took out most of the engine bolts to try to get it to drop a bit for more clearance. I can rotate the valve cover, but I can't get it off. Yes I tried to crank over the engine slowly and see if I could clear it. Other than pulling the engine, any suggestions?

[thedakotakid]

Take the front motor mount off the frame and remove the upper rear motor mount bolt that should let the engine tip down in the front.

Did that already. Finally got it off. I am going to try to peen the frame a bit to get some more clearance