Question to all the welders out there!!!

Try double gaskets on each side.old or used headers or ones with flanges cut.flaten header flange surface with large bastard file,knock off any high spots on the welds.had a new set of hooker pro comps.the black ones with welded on badges wouldn't seal had the put em on a big surface sander used to retrue heads.ended up useing copper o-ringed gaskets from Ed hamburg.