<VV> Carb Venturi Cluster Part Numbers

[James Davis]

The casting cluster number you are looking for is #20338, which is 
Rochester part number #7029337.  Now for the rest of the story: In 2000 
the late Bob Ballew wrote an article titled "Proper Idling and Why It 
Doesn't???"  in which he stated there are six different venturi clusters 
all cast with #20338 on the cluster arm.  His advice: "The only way I 
have been able to match up the carbs on my engines is to measure the 
holes in the idle tubes, the idle air bleed, the high speed air bleed 
and the high speed siphon break hole."
Jim Davis

Greg Hanlin wrote:
> Does anyone have a handy table of what part number stamped on the venturi cluster arm is for various applications?  I'm specifically interested in which venturi cluster is supposed to be in the primary carb for a 65 140HP Manual trans engine.  The carbs I tok apart have two different style clusters in them and I'd like to correct this!  I have a selection of clusters with various part numbers on them to choose from.  Thanks in advance,
>
> Greg Hanlin