McCargar Posted January 24, 2022 Share Posted January 24, 2022 I am using a Rochester Carb (Autoline C-938)and was wondering what the orifice beside the idle adjusting screw is for? It is threaded and sucks air but I have no idea of its use. Link to comment Share on other sites More sharing options...
carbking Posted January 25, 2022 Share Posted January 25, 2022 Distributor vacuum? Jon Link to comment Share on other sites More sharing options...
Oldtech Posted January 25, 2022 Share Posted January 25, 2022 Yes, vacuum line to the distributor. Was metal on 50's cars. Link to comment Share on other sites More sharing options...
McCargar Posted January 26, 2022 Author Share Posted January 26, 2022 Thanks for the info. I don't have vacuum advance on the distributor so it will just get blocked off. Link to comment Share on other sites More sharing options...
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