Stones or Carbide for valve work?

HowelGrace said
It's been a year but, sounds like you're gearing up for some serious valve work and porting. Both stones and carbide cutters have their pros and cons. Stones are great for initial shaping and can be more forgiving, but they wear out faster and might not give you the precision you need for fine work. Carbide cutters, on the other hand, last longer and provide a more consistent cut, which is crucial for porting work.

Any time I've inspected and reassembled heads for customers that are ooth box carbide cut seats I've needed to lap in the valves. When I do my normal valve job with the stone I have found they seal much better. A cutter doesn't leave a uniform concentric seat , there is always a high spot and a low spot. That's what I have found.