Thermo-Quad metering rod measures

DionR said
Here's a 75-1966 rod. I would have to go digging to see if I have any other loose one, or take one apart.

Did my best with my HF calipers, I suspect there are better ways and more accurate tools. I didn't match the economy step either.

Not sure how the midrange step works since there are only 2 parallel sections. Maybe the long taper midpoint is the midrange step?

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It would make sense .655 is idle. The taper is transition and the .0455 is the richest. I see no reason why a two step rod like in the Edelbrocks or Street Demons couldn't work if they are the right length. I have some of each if yall want a comparison.