[lt1silverhawk]

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

[lg1969]

"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.
[/IMG]

[cliff tate]

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

[lg1969]

The PCV port can be use to run brake booster if there is no port on the manifold.

[lt1silverhawk]

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. 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!

[lg1969]

Do not leave it plug. you need to leave it open. The choke may not open at start up

[lt1silverhawk]

Originally Posted by lg1969

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?

[lg1969]

just leave it open or run a up into filtered source from an air cleaner after the air filter.

[lg1969]

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.

[lt1silverhawk]

Originally Posted by lg1969

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?

Originally Posted by lg1969

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?

[cliff tate]

Originally Posted by lg1969

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

[lg1969]

I have seen it done. They use a "T" to connect the brake booster and PVC.

[cliff tate]

Originally Posted by lg1969

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.

[OLNOLAN]

http://www.holley.com/data/Products/...7948-5rev3.pdf

http://www.holley.com/data/Products/...R7972-4rev.pdf

[lt1silverhawk]

Originally Posted by OLNOLAN

http://www.holley.com/data/Products/...7948-5rev3.pdf

http://www.holley.com/data/Products/...R7972-4rev.pdf

Thanks Nolan! Those were very helpful!