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IM not 100% sure of your question, but a crank by it self ,sitting in a properly machined block with the bearings in place, having been coated with a decent assembly lube, and the main caps torqued in place should require no more that 10 ft lbs to spin (MAXIMUM) and in most cases less to keep it spinning, in-fact most are easily spun with finger pressure alone.
if it takes more than 10 ft lbs somethings either not machined correctly or your clearances or lube are wrong.
I generally use molly assembly lube mixed 50%/50% with marvel mystery oil as a bearing lube during assembly, and that provides a good slick surface on the bearings.
after you add the rods and pistons with the rings its resistance to rotation obviously increases but should still be UNDER 40 ft lbs to spin an assembled short blockhttp://www.summitracing.com/parts/CRN-99004-1/?rtype=10