Main issue is the pins and bushings on the cope and drag wearing overe the course of production. The foundries don’t pay close attention to this! Been in many foundries and they all have same problem from time to time. Lack of good QC.
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Originally Posted by SSDiv6
Yep. It is called "Core Shift". Caused by a deviation during the casting process due setting on the mold, mold alignment issues, mold temperatures and pressure differentials. One of the many reasons why the fast guys spend lots of money testing and going through many castings.
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