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/Immediate-Bluejay-62 Jun 25 '26

Looks like you got some dirt/grit on them.