The most likely point of maximum wear will be the vertical measurement with the crank journal at the bottom of its rotation. The least-worn spot will be 90 degrees from that point, side to side with the crank at the bottom of the stroke. It's not uncommon to have 2-3 thousandths difference in those readings, and/or some taper wear from front to back. The maximum allowable wear is .001" out of round, and .0005" taper.

Try measuring something round like a big socket to get into practice measuring crank journals. It's an acquired skill, for sure!
Jerry

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