Another first with Speedmaster heads. This one had me scratching my head

RustyRatRod said

Are the guides spaced the same from your heads to those? It makes you wonder "what else" is inconsistent.

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It’s the chambers. They are as cast. You see it all the time.

Unless it’s really bad I just let the top cut of the seat cutter take it out.

If they are too bad then I use a cutter like PRH posted above.