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Thread: 1955 Thunderbird, new carb tuning issues
          
   
   

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  1. #4
    John Palmer is offline CHR Member Visit my Photo Gallery
    Join Date
    Jan 2004
    Location
    Santa Ana
    Car Year, Make, Model: '32 High Boy, '60 VW, Teardrop Trailers
    Posts
    355

    You need to set and adjust items in a "specific order" and not jump around as your post suggests. For example you can't adjust the mixture screws until you find out why it's idling so fast (at 1100 RPM). Maybe go back and try it in this order.

    adjust the valves first, check the compression, make sure the carb linkage is free and allows it to return to idle and the choke fast idle cam is not sticking, set the dwell (if it's still got points), Then set the initial timing without vacuum connected, then check for total timing. Some of the Y-Block motors had a double diaphram distributor, one was for manifold vacuum and the other was for venturi vacuum. I'd only use the venturi vacuum port since your not using a stock "Teapot Holley" carb, and set it at 10 degrees before TDC. Make sure the old vibration dampener has not turned which would through off your timing marks. Make sure the secondaries are not sticking open (Holley's have/had a set screw on the base that was an adjustable stop). Are you certain that you don't have a intake gasket vacuum leak?

    If it still runs at a high idle then look inside the carb.

    Good luck
    Last edited by John Palmer; 08-18-2008 at 11:40 AM.

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