machining o200 cyclinders

I have read that 85 pistons in the o200 require a slight chamfer on the piston to clear the head. has anybody tried to machine just past the cylinder into the combustion chamber to make room for the piston. the idea here is that typical hemi heads have horrible swirl. by cutting into the combustion chamber to make room for the piston there will be a ledge or shelf 90 degrees to cylinder wall and create more turbulence.

Dunno, but there is already a cracking problem with these cylinder head castings. It is not serious, usually noticed only at overhaul, but still - do you want your head departing in flight?