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Old 05-24-2009, 03:43 PM   #1
19stang66
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Default Vacuum port on Holley 4160??

What is this port used for on my 4160? Nothing has ever been hooked up to it. The picture shows the front of the carburetor. Thank you.

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Old 05-24-2009, 04:05 PM   #2
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lol on mine. that port and hose goes to my dizzy. and my engine sounds good. I do not know if that is right or not. Also, what is the hose in the picture go to... on mine, nothing is plugged into that port.
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Old 05-24-2009, 04:25 PM   #3
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Click the image to open in full size.

I'm pretty sure that is for the electric choke, but I may be wrong. Do you have a picture of the hose that runs from your dizzy to the port i was asking about?
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Old 05-24-2009, 07:04 PM   #4
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So I just found this picture and it describes the port I was talking about as "Full Manifold Vacuum Source connects to air cleaner and/or air pump diverter valve."

So if I don't have anywhere to connect it to my air cleaner (it's an aftermarket K&N) then where should it go?

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Old 05-24-2009, 07:58 PM   #5
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On your 66 Mustang, this diagram applies, with the "timed spark" port at the carb end:

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Old 05-24-2009, 09:03 PM   #6
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I believe its just a full manifold vacuum port that is available for use with any extra accessories. If it's not being used, plug it up.
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Old 05-24-2009, 09:23 PM   #7
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Sounds right. I've just read a few Holley manuals and they said to plug any unused vacuum ports so that is what I shall do. Thanks for your help.
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Old 05-25-2009, 09:41 AM   #8
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It is the easiest way to access full vacuum for tuning. It also can be connected to your distributor if you are using full manifold vacuum (vs. ported vacuum on the upper nipple) for your vacuuum advance on the distributor. Also, if you have an aftermarket a/c unit that used engine vacuum to control the duct solenoids, connect it to that nipple.
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Old 05-25-2009, 11:35 AM   #9
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Quote:
Originally Posted by 19stang66 View Post
Sounds right. I've just read a few Holley manuals and they said to plug any unused vacuum ports so that is what I shall do. Thanks for your help.
if it was open (not blocked with a nipple), then my opinion is: "your engine ran like crap ..." ;-) please do block all unused vacuum ports
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Old 05-25-2009, 12:27 PM   #10
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OK. Here is my question. I love learning how these carbs need to be hooked up. Anyways, The arrow I have shown, What is that? Is it a vaccum port. And the line which connects to that to the top of the carb. What is that for?
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Old 05-25-2009, 12:27 PM
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4160, 65, carburetor, defined, diagram, distributor, full, holley, lines, manifold, mustang, port, ported, ports, timed, tuning, vaccum, vacum, vacuum

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