Raised Port Head Question
Well...... if you end up without a radius there...... yes, it will create a stress riser.
For a mild cam situation...... will it matter?
I’d rather try and do it in a way that doesn’t end up without a radius there.
For a no machining option......
A smaller diameter spring might work, or a spring that’ll work at a shorter installed height, and then some -.050” locks to move the retainer away from the valve tip.