<VV> 140 timing (with 280 isky cam) and 4 primary carb tuning advice wanted

[Bryan Blackwell]

Consider that a stock primary has some airflow even fully closed if  
the throttle plate has the little half circle cutout.  I'd run the  
idle mixture screws out and see if that helps.  There's so little  
airflow needed the idle circuit could well make a difference.

--Bryan

On Nov 25, 2009, at 7:45 PM, Ray Rodriguez III wrote:

>     For those still reading...  about my carbs....   I have 4  
> primaries... currently running them like stock secondaries.. idle  
> screws all the way in, and linkage set so they dont come in till  
> heavy throttle...   can anyone give me opinions backed up by logic/ 
> facts on:
>
> A)  reasons I might want to use the secondary idle circuits...   
> opening the mixture screws and setting them up (balancing with the  
> vacuum guage I would assume?)  What affect this would have on  
> performance etc....   I have only a very vague understanding of  
> carbs.. I dont know why two extra idle circuits would improve  
> performance...  wouldnt it only affect the engine at idle anyway?