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We are using the OE GM gaskets for the header to engine surface. They aren't leaking. There is no gaskets for the JBA V6 headers to exhaust pipe connection. They have a 2.5" "V" clamp, band, that hold the two flanges together with a metal to metal surface contact. This is where they tend to leak. Welding less than 3 inches from a flat surface will not leave a flat surface when finished.
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