Often times with those cutters that have multiple angles above the seat...... there isn’t enough radial clearance in the chamber before the cutter OD starts carving out the chamber wall.
Sometimes that’s a problem...... sometimes it’s not.
Also, many heads will require sinking the valve a fair amount to be able to utilize all the angles.
Sometimes that causes issues on the top side of the head with regards to tip heights and installed heights.
It can turn into a “be careful what you wish for” scenario.
It’s playing with that type of thing where having access to your own machine really comes in handy.
