What do you have in place of the mixture screws on the end carbs?  As Ted mentioned, it;s better to have these in place and shut.



54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Are both end Carbs drawing Air or just One? There's your problem I  think. Its running lean unless You activate the Choke to it draws more Fuel through the Center Carb. Additional Air from end Carb(s) is leaning out the Mixture.. Maybe U should contact Charlie and ask Him why its drawing Air even though the Throttle Plates are supposedly closed.

  

Thanks for reply! It's a "stock Rebuild".
Meaning no over bore. Stock cam.
And rebuilt heads. Nothing exotic..
Previously when I had this "issue". I did take off both end carburetors,and I used block off plates and ran just on the center carburetor. Honestly, it ran perfectly fine with that center carburetor. Here is why I'm confused? I sent both of those end carburetors to "Charlie".he did a fine job making sure the throttle plates were completely shut. BUT! When I hold my hand over the throat of the end carburetor, i can feel it drawing my hand down like it's sucking air...

I’ll suggest blocking off the end carbs at the manifold and running off of the center carb only.  If that fixes the problem, then revisit the end carbs.  I personally like the idle mixture screws in place on the end carbs for those instances that the end carb throttle blades do not close off completely.  I’ve also had cases where the camshaft was too wild for the carbs and the air bleeds had to be downsized or modified accordingly.  With 20”Hg manifold vacuum I don’t think your camshaft is overly wild so that should not be a problem.  You might mention the camshaft specs anyhow just to rule that out.

Lorena, Texas (South of Waco)

Hi guys! I know most of you visit the
Other sites. So for those who don't,
Here is my "issue". I'm sure it's been
Discussed before. I have a " rebuilt
Y block". It has "trips". The center carb.
Has a 7.5 P.V. rebuilt. jets#52. The two
Outer carbs. Have no P.V. or mixture screws. They are just there to dump
Fuel! Jets# 50. They were reworked
By "Charlie", to make sure throttle shafts
Are shut! The motor has 20# vacuum
@idle. Here is the issue I am having, I have to constantly run with the choke about halfway closed. If I don't it won't accelerate or run? I've tried all the usual checks for vacuum leaks etc. Maybe someone has a suggestion on this site?
Thanks for all replies!