To me a vacuum gauge is to pressure as a multimeter is to electricity. You can see small changes that without it , you would never know. I will be interested on this as I am restoring a 1965 LPB with a rebuilt SD40. Not as far along as you.
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I second this advice. It follows the literature in the OE manual which directs the rebuilder to adjust the installed height of the metering rod, although the picture does not look like my SD40 at all. Furthermore, there is a step up rod adjustment made by bending the little u shaped rod under the bowl.I found the pic!
I bent this arm down (at the crescent) down like 2-3mm. Solved my bogging down issue. Props to @mattressking for coming up with this fix. He knows his carbs.
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Yep, it's very vague and without the SST, we can only guess. I have played with my SD40 a lot now trying to get the bog away without the choke, especially right when it gets to temperature and it is nearly there but not perfect.The correct SST kit for these early carbs are of course almost impossible to find. It’s a bummer the FSM never gives an actual measurement and just say use the SST. :/