I messed with it quite a bit. I don’t recall now if Smokey gave angles or not but Terrell didn’t.
So I screwed around with different top cut angles and widths and with the back cut angles and widths.
If I had my notes I could tell you what all that stuff was but it would just be a WAG at this point.
Like I said, it never worked for me with the seats and angles and widths valve jobs I use.
You may find that it works with the seats and angles and widths you use.
Edit: Terrell says 30-45 top cut angles so maybe Yunik gave them too. I just can’t remember or find his book.
I do recall I went through a lot of valves trying that stuff and I’m pretty sure I even tried the seat angle on the top cut. And different back cut angles.