Pull the intake and look. If it appears the bottom of the intake ports are razor-thin instead of having a decent sized bottom flange edge, contact Edelbrock. If you have composite gaskets, the bottoms might be missing or visibly pulled into the ports. It would cost too much to TIG the entire lower port bottoms to widen them, then remachine the sealing surfaces. Just guessing but we suspect these were 2V-intakes that were 'redone' to 4v dimensions, and there just isn't enough metal available to do this. They may have been released in error- likely not very many but as with bad cams, it does happen.
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