Holley Double Pumper Question(s)

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340inabbody

340inabbody

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Hey guys I am not very familiar with Holley’s and carbs for that matter. I am in the process of getting my 340 running again but have some questions on my carb.

Is the lever with the black spring that I am pointing to connected to the throttle linkage the secondary throttle body control?

IMG_1884.jpeg
 
69FBCuda said:
Your missing the rear set screw.
Click to expand...
Is there a decent parts diagram that can identify that rear set screw? I don’t know where or what screw that is.

Also the idle set screw doesn’t engage and there must be a reason. It is like it’s 3/8 too short but I know that it’s not. Does the carb need something to bring the idel set point farther up or something?
 
340inabbody said:
Is there a decent parts diagram that can identify that rear set screw? I don’t know where or what screw that is.

Also the idle set screw doesn’t engage and there must be a reason. It is like it’s 3/8 too short but I know that it’s not. Does the carb need something to bring the idel set point farther up or something?
Click to expand...
1714856011984.png
 
340inabbody said:
Yup the AF set screw now I know what you’re talking about! Thanks! It was in there must never been set right bc it must have fallen out….
Click to expand...
Pretty sure there should be a cork O ring that goes on/in with the screw

#oldmanmopar

Holley 20-7 Carburetor Throttle Lever Extension

Carburetor Throttle Lever Extension Readily Accepts Chrysler Throttle Lever Stud for Simple Throttle Hookup
www.holley.com www.holley.com

1714856441636.png

P
 
Last edited:
340inabbody said:
Is there a decent parts diagram that can identify that rear set screw? I don’t know where or what screw that is.

Also the idle set screw doesn’t engage and there must be a reason. It is like it’s 3/8 too short but I know that it’s not. Does the carb need something to bring the idel set point farther up or something?
Click to expand...
Look into the hole really good. A lot of them have the hole but it's not finished and drilled all the way through.
 
Yeah, if it's a 2-corner idle deal, it won't have idle mixture screws on the secondary side. Pretty easy to tell if you look at it closely.

edit - or you can look up the list number to see if it's supposed to have 2- or 4-corner idle adjustment.
 
I forgot to mention your throttle linkage is fine. You only need the aftermarket lever if you can’t get the kick down linkage hooked up, if you even use it.
 
Welp I can’t get a paper clip more than .25” in the hole so it looks like it’s not a four corner after all.

Can you guys help me understand the other issue I am having?
 

The other issue I am having is the that the throttle is not making it to the throttle stop screw. No where near it actually.



IMG_1897.jpeg
 
It’s not any of the cables or linkages as I have disconnected them all. Still will not hit the throttle stop screw which is turned in all the way.

image.jpg
 
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