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Ensuring that the header flanges are true prior to installation is a necessary evil with ALL aftermarket headers... I have yet to see a single one that was adequately decked out of the box. Most are made in China, the land of non existant attention to detail and then re-sold by people that don't know what the sealing surface is supposed to look like..
Until you pull the headers and have them decked true you can expect to have this issue and some are worse than others.
This is another reason why we are building our own!
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