It is. I would do that no other way than to use the proper fixture that mounts to a pilot that fits into the valve guide. I am also looking at carbide cutters.
Interesting. With the pilot it shouldn't be that bad then. I need to look into a fixture to hold the head on my mill table. I can make any shape form tool I want on the lathe, heat treat it, mount on an arbor and Bob's your uncle. I'd feel a lot more confident about not hosing up a nice valve job trying to do the bowl by hand if I can do it in the mill. Should be able to accomplish it with material on hand. Sounds like a good winter project to get some more flow out of the J heads.
