Yes, inside the chamber.

I have never seen a pair of those heads, but the De-shrouding has it's best effect when the valve is opening and closing.

While it is lifting or seating, only 5/8ths of the valve is unrestricted. Once it is past 1/2 way open the valve shrouding effect starts to decrease.

But be sure, if it looks like a restriction, then it probably is. Just a little rounding off of the corners is all it takes to de-shroud. Wish I had a good photo to share.

Open chamber heads are not as bad for shrouding as the quencher chamber heads I show in my photos.

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66 Stang 385+ HP 306 .494 /.520 225 durr @.05, 200cc Windsor Sr's, Edle RPM, C4, 3.00 posi, 575 Annular Mighty Demon, 22 MPG,