i have rebuilt 3-4 different B motors and have seen shinny spots on the shaft and small wear on the rocker arms. Seems like it was only a couple thousandths. Maybe im lucky, but i just cleaned them up and reinstalled. Seemed to oil o.k. Some of it might be the end plates on teh pump itself. Smooth plates with very minimal clearance will increase the flow available to lube. As Dave said, the tube inside the filter is the "restrictor" that allows a small amount to blead off thru the filter. I think the tube has 1 or 2 of a 1/8 inch hole in the top. No tube or big hole will cause low flow / low pressure.
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