M code Cooling system questions

Dana67Dart said

I know the outlet is larger 1-3/4 dia for the BB vs 1-1/2 for the SB, does anyone know if from factory it was 2 or 3 core?

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I think that you’re right about the neck size. I seem to remember that I used the top tank from a 383 B-body when I had my radiator built.