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What are the slits on the header flanges?

flanges header slits
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What are the slits on the header flanges?

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JBA Headers feature ultra thick 3/8 laser cut flanges. On these flanges you will see that the bolt-holes have a slit. This slit is created during the laser cutting process. It is not there for heat expansion reasons and it doesn’t have an effect on the bolts ability to stay tight.

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