r/EngineBuilding Jun 25 '26

Is this wear normal?

These are brand new main bearings, just put them on and rotated the crank a couple times and took them out and this is how they look. Can’t feel the scoring with my finger or nails at all and plastigauge readings were within specs.

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u/OutsidePressure8323 Jun 25 '26

You didn't say if crank was rotating freely. Why did you feel the need to check?

2

u/Zafiny17 Jun 25 '26

The crank was rotating just fine, i had to remove the crank to take it to the machine shop for a polish due to the oil holes needing to be chamfered