I'm just trying to learn. I'm not defending anything or anyone. I would think that anyone capable of cutting seats for larger valves would know to cut the throat and a blending would be easy enough. PPR is the one who brought it up.
I didn’t have the proper tooling to properly set the throat sizing for years and did it by hand. Neway seat cutters, stones, etc have been used and still are used by most to do valve jobs and can not set the throat size. My local shop that did my stuff for years could not set throat size because although they had the machine capable of doing it didn’t have the right cutters. You can have the best tooling in the world and if you don’t understand head flow and head working techniques you are doing half the job.