LA 360 - 0.030" Undersize Main Bearing Clearance Questions

kick said

I’m assuming that you are using a quality micrometer and it came with a standard to check its calibration. You then also checked the calibration of your dial bore gage with that micrometer?
If your measuring instruments check good. Measure the inside diameter of each main bore with the bearings installed and reference those numbers to each journal on the crankshaft that you checked. Then you’ll know what actual clearance is of your bearings.

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The micrometers are mid/hobbyist level (Fowler), but both the 2-3 and 3-4 mics that I used for this were calibrated with a gauge block directly prior to taking any measurements. But yes, I did exactly what you stated here to get the bearing clearances I have listed in the initial post.

Main #1: 0.0016" - 0.0018"
Main #2: 0.0017" - 0.0019"
Main #3: 0.0017" - 0.0019"
Main #4: 0.0019"
Main #5: 0.0009" - 0.0012"

The variance represents the small amount of out-of-round for each main journal.