65nailhead Posted February 6, 2022 Share Posted February 6, 2022 Hello All, I’m new here so this may have been covered. I have a 65 Riviera with a 401. I am currently rebuilding the original carburetor. It is a Rochester 4GC model 7025040. I recently moved to Wyoming and live at 5000’. The jet sizes are currently 52 primary and 80 secondary. I’m not sure if this is stock. The car came from the Central Valley in California. Maybe a few hundred feet above sea level. I know I need to drop jet sizes with altitude. If this is stock jetting I guess I would drop 2-3 sizes. I accidentally posted this same question in the Technical section. I think that was a mistake. I’ll try to figure out how to delete it there. Any help would be appreciated. Link to comment Share on other sites More sharing options...
telriv Posted February 6, 2022 Share Posted February 6, 2022 IF you don't have one I suggest you get a '65 chassis manual. It will have ALL the info you need. Tom T. Link to comment Share on other sites More sharing options...
65nailhead Posted February 7, 2022 Author Share Posted February 7, 2022 Yes Sir I have one ordered. Just trying to get jets ordered too so I can get this thing back together. Thanks for the reply! Link to comment Share on other sites More sharing options...
telriv Posted February 7, 2022 Share Posted February 7, 2022 Just be patient. Link to comment Share on other sites More sharing options...
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