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I have been told about the 3-2-1 method about cooking spares or St Louis, but if I were to do baby backs, would I reduce it to a 2-2-1? I'm going to be making 2 or 3 racks this weekend, and I want to try wrapping one of them
That is the normal guideline for baby backs. I say smoke until you get the color you want on the ribs, then wrap for 1.5 - 2 hours then pull of for another 30 minutes to an hour. If your smoke temp is a little higher, they may cook faster.
just be careful I recently did my first rib rack and set the smoker at 250. I tried to do the 2-2-1 but by the end of the second 2 the ribs were over done.