A couple of years ago I went to Chris's Carbs in Dayton, OH for some carb help. Chris and his son, also named Chris, are the only employees. Dad is a older guy and has been overhauling carbs since he was a teen. He had several huge piles of carb carcasses on the floor and on work tables. He may be able to help. 937 890-0970. I think he told me that he does the dichromate treatment also. He has a big block Chevy on a test stand where they test and adjust carbs. Dave R.