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One odd thing I noticed about them though is the center ports are raised about 1/4" higher than the end ports so their not lined up real well with the head ports, the bolts line up but not the ports??? ...
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I had expensive 5208's that had exactly the same problem, but the entire flange was drilled too high causing the gasket to blow at the top of every port. If I knew that I would have redrilled them, but I sold them and then noticed the problem, I forwarded the info and the buyer said no problem..thanks buyer !