I have that same Sioux grinder and a Black & Decker grinder, both with more stones than I will probably use in my lifetime. As for doing 3 angle valve jobs, Dad ALWAYS did that. Didn't matter if it was a lawn mower engine, car, truck, tractor, or hit & miss, or one of the local Dragsters or Funny Cars, they ALL got the same 3 angle valve job.
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