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Old 01-15-2022, 07:26 AM
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steve25 steve25 is offline
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Unfortunately that short block in my opinion now needs a complete rebuild with oversized pistons again and a cut crank that is polished the right way!

Cast cranks due to there nodular carbon content need to be rotated in the right direction so these nodules do not stand up and slowly grind up the Bearing surface and itself from the grit that gets put out.

This added level of fiction also heats up the oil locally and can break down the oil film in that high load critical area!

Some shops leave the crank polishing work to the low knowledge shop helper who does not know the proper way to polish a cast crank, ( no less one that has been cut also! ) and then results like yours take place , or even way more Bearing damage from the much higher rpm and loading of a race motor.

Please also post up a few pictures of the rod caps without a Bearing in it and the back side of the Bearings that came out of it,

Here is what the Ferderal Mogul Bearing catalog instructs about polishing a cast crank.

PS.
This time use a one piece rear seal!
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Last edited by steve25; 01-15-2022 at 07:45 AM.