SM Head Modifications on a budget

PRH said

Is that bowl shrinking going to be a clay or epoxy mod?

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It would have to be epoxy. I've tried raking the clay in a throat before and it didn't go well. Clay does not like a feather edge and doesn't do valve angles well. It would take some thinking about when to try it because it would obviously be the end of the step 1-5 process we are in.

I've done this once before and I was shocked at the improvements. Short side shape needs to stay unchanged with the throat reduction happening on the sides and the long side.