Take them off and get some porting tools and go to town
Are you talking about the port area inside flange or are the tubes protruding into the "log" area? What headers do you have?
Wasn't talking about the port area, talking about down the blind holes of the tubes. Where any debris may be sticking around. These are TA brand new headers. I packed them up and shipping them to be sonic clean. Before I have them ceramic coated.