How much can valve head OD be cut?

Thanks for all the comments... the MP AL heads are 2.02" valves, so no relief there.

I just may slide back to EQ/Indy heads and see what that will do to make things easier.... 1.92" valves gives .050" smaller radius on the intake. Part of this effort is to make this mostly an off-the-shelf-parts build and fancy head work doesn't fit in with that idea.

I've run 10.3 SCR and 160-165 psi on iron with quench... worked fine and I did all sorts of things with that engine, including towing, but I had to be careful on the tune. This build ought to end up with 9.5-ish SCR and quench with EQ heads, so cranking compression with the cam I wanted to use will be in the 150-155 psi range at local altitudes. So it has that going for it to help with iron heads. Iron just does not give the extra margin that AL does, and I realize I am getting lazier on tuning in my old age LOL