exhaust leak common after header install?
#2
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Depends where it came from. Do you know what gaskets were used? NEVER use the paper gaskets that often come with headers, either reuse the stockers or buy new GM gaskets. If it's the header/y-pipe connection some good band clamps can really help you out.
#4
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if the headers are slip fit to the ypipe, you can put a little bit of copper seal on the header before you slip it into the ypipe. then put the band clap on. this will make it seal better.