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Thanks guys,
I will disassemble them and give the a treat with the die grinder. CNC is out of my budget, but smoothing everything, especially the bowls I can do myself.

What is best protection for the valveseats when grinding the bowls except not to contact them with the grinder?


take your time by the seats!using a short extension with sanding cones will be more stable and wont chatter on you with a slower rpm.maybe put tape on the seat.