As a point of interest, a 2.30 intake valve will hit a 4.375 bore at a little over .800" lift.
Doesn't surprise me, 2.30 valve is pretty big and 4.375 is kind of small for an engine that needs a 2.30 valve. Typically you would want a 4.500 bore for that big of a valve. It might not pay to put a 2.300 valve in a head if the bore size is only 4.375.
Upon my discovery I came to the same conclusion. I also learned that stock valve spacing limits you to I/E valve sizes of 2.250/1.81 or 2.30/1.78. Not enough radial clearance for 2.30 and a 1.81. Nothing super technical in that experiment, just mocking up parts on hand.
This is for my -1 tunnel ram 511 with a little over .800 lift.
