Stock Eliminator Cylinder Heads

[SSDiv6]

Originally Posted by Ed Wright

After I built my flow bench (could not just buy a SuperFlow) back then) I was shocked at the variation of air flow between different castings, same casting numbers.

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.