Quote:
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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I knew a local machine shop that had a back room full of castings. He let me take several for testing. My ‘56 was newly allowed the “520” castings. I discovered the 520X castings.
Held more CCs than legal. I had decked my block a lot, so needed to mill the intake side of my heads a lot so the manifold would fit. Got rid of some intake CCs.