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It can be hard to monitor the scale while you are concentrating on making a steady, even pull, so Fry recommends a scale like this that will mark the highest amount pulled so you can check after the fact. For a wet-sump Late Model Stock engine he says he looks for 5.5 to 6 pounds of resistance. More equals drag, and less usually means you will be burning oil on the track. If you are building a Street Stock with OEM-style rings, you will probably have to deal with a little more drag.