I would have to check my notes, but I thought I had .035 cut from the head and I used a .042 head gasket in place of the old .052. I use icon pistons. Evidently they don’t have deep notches. Something else odd I found while decreeing cam, when I installed straight up, dot to dot, the exhaust valve ran right into the piston. It did not do that at any other point , A4, A2 or R4.