TF & Speedmaster Flow Tests

PRH said

For comparison……..what is the bowl diameter of the TF head?

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TF bowl is 1.996 or 98.8% at the tip of the bronze guide. That is the widest point and it tapers toward the throat.

Factory CNC Speedmaster is 1.904, 94.3% at the guide and 1.923, 95.2% between the guide and the throat.

I would enjoy the opinions and theories on bowl sizes. I have several conflicting thoughts bouncing around in my head.