Cylinder head milling

Wrong, where did you read that? The correct relationship is for every .010 on the block face you need .0095 from the intake face of the head. So .040 means cut .038 from the intake face of the head to keep the same relationship for a head. I have never milled the china wall on the intake or block. You can guess or play games, I'm just not into that.
You are correct, I miss read the information