You got any more detailed pics of your bore chamfer? And an explanation of how/why it's done? Is it like deshrouding but on the bore instead of the side of the combustion chamber? Does it not affect ring seal/piston wear? Or do you just have make sure it isn't deep enough to contact the ring?
Did you click on my picture I posted? Then click it 2 more times to make it bigger.
You can see the chamfer, it is where your 1025 head gasket flares out more. That (1025) head gasket it not a perfect circle.
You do not chamfer down to where the rings seal, just above that point.
Doing this mod allows for more airflow.
MBHD
