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"But how do it know?"
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Discussion Starter #1
Hi All,


I need help identifying the various components on a Holley 4160 carburetor.


Today, I'd like to focus on ports. Below is a picture of the carburetor with the ports circled and labeled. When responding, please use the alphabet labels.


From what I can tell/guess:

A: Brake booster
B: PCV / Vacuum port
C: HEI / Vacuum port
D: Fuel inlet



Thanks in advance :thumbup:


 

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Google "Tunnel Ram 406"
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"B" is not a vacuum port for PCV. That is air inlet to open the choke. There is a "U" shape line that is missing and is connect to a tube(missing) that is pressed just above choke housing. Inserting a plug will prevent the choke flap not to open at start up.
"A" Is not just for the brake booster, It's also the PCV vacuum port.
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holley carbs

A is pcv only,B is for heat from the ex to regulate the choke,this carb has elc choke conversion, not oem.the small tube is for the vacume advance(ford style)the larger tube is gas
 

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"But how do it know?"
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Discussion Starter #5
Hey lq1969 and cliff,


First off, thank you both for the helpful responses. Definitely appreciate the editing of the picture so I can see what you mean. :thumbup: My only experience with carburetors so far has been the Q-jet, so I thought I would play it safe and ask before installing and setting this one up.


Now, as you guys have mentioned, port "A" can be used for PCV or brake booster, provided there is no port on the intake manifold for the brake booster. I will check to see if the intake manifold has a port for the booster.


Port "B" is an air inlet for what I assume would have been the hot air choke? Since the electric choke conversion has been done, I might as well leave it plugged up.


Port "C", the small inlet is for the Ford -style vacuum advance, but I assume is fine to use on a GM HEI?


Again, thanks for the help! :thumbup:
 

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Discussion Starter #7
lg1969 said:
Do not leave it plug. you need to leave it open. The choke may not open at start up
Got it. Will I need the U-shapped line, or will it work just fine without it?
 

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BTW: The accelerator spring is not setup right. It's all compressed. If you hit the gas pedal hard it could rupture the pump diaphragm. Gasoline is not compressible.
 

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Discussion Starter #10
lg1969 said:
just leave it open or run a up into filtered source from an air cleaner after the air filter.
If I end up using this carb, I'm thinking of using a carb hat with a custom-made intake (probably cold air) with some sort of a provision where a hose from this inlet can be hooked up to it. What are your thoughts on this?




lg1969 said:
BTW: The accelerator spring is not setup right. It's all compressed. If you hit the gas pedal hard it could rupture the pump diaphragm. Gasoline is not compressible.
Would the accelerator spring be the one circled in yellow in the image below? What is the proper setting for it, or does it vary depending on the set up?


 

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lg1969 said:
The PCV port can be use to run brake booster if there is no port on the manifold.
not wise,unrestricted vacume source is esential for pbrakes.re choke the the heat tube should stay closed with elc.choke,the vacume source was only needed when non elctric choke used as it needed a good flow of heated air to expand the coil and open choke
 

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lg1969 said:
I have seen it done. They use a "T" to connect the brake booster and PVC.
dont dought some 1 has put a t in but that does not make it corect,.re the small vacume line the ford port is not for a gm distributor, they use manifold vacume.
 

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Holley

Good deal. Here is a link to Holley's numerical listings. This allows you to determine if a used carburetor has been modified with different jets, etc. It also provides the part and kit numbers as assembled by Holley. It also has been valuable to me by providing information on obscure purpose built Holley carburetors. For instance, a Mercruiser marine big block carburetor built to a specific cfm for the application, with staggered jetting to compensate for lean running cylinders as dyno tested by Mercruiser. I printed the complete listing some years back, increased the print size to fit a 11.5x14 page and made a book to put in my shop literature.

http://www.holley.com/data/TechService/Technical/Carb Numerical Listing.pdf
 
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