AggieAv8r,
Try this, bolt it up without the graphite gasket and use only the RTV gasket maker. The RTV alone can seal it.
The ART pipe flanges are indeed flat. They are all ground and surfaced flat at the factory AFTER welding onto the pipes.
If there is a chronic leaking problem you might want to check your header outlet flange to make sure it is not warped or has anything unusual.
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