On my points distributor, it was an estimated 0.0125" per distributor degree.
My slot length measured 0.375".
With a pin/bushing diameter of 3/16" (0.1875) I had 15 degrees at distributor, which was higher than my target.
I used a Moroso press-on bushing, with 0.25" OD. This resulted in 11 degrees advance at distributor, 22 @ crank, and I called it good.
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