Carburetor Identification

[NYsquarebird58]

This is the Holley carb that came on my squarebird. Can anyone identify what model Holley this is?

The car bogs badly under load. I have to baby it up hills. If I give it too much gas under load the engine bogs and stalls. It'll rev all day long and idle beautifully when there is no load on the engine.

I still have things to check like the timing chain tension and distributor but any info on the carb would help too.

[YellowRose]

Carburetor Identification

Marcelo, it would probably help ID it, if you have any pictures that show any lettering or codes on the outside of the carb. All I could see was the word Holley.

[arizonajack]

Likely a 4160 according to this list:

http://www.mustangtek.com/4160/holley4160.html

The number should be stamped on the air horn according to the following picture:

http://www.carburetion.com/images/carbid/holley9.jpg

You'll have to take your air cleaner off to see it.

[jopizz]

There should be a part number on the front of the air horn. Check your vacuum advance. A blown diaphragm could cause the symptoms you describe.

John

[NYsquarebird58]

I wanted to replace my vacuum advance, but I cant find a new vacuum advance that accepts the screw in hard line. I'd like to keep the hard line; one less rubber hose to deteriorate.

Any idea who still makes these?

[jopizz]

Concours Parts shows one in their catalog but there's no price so I guess you'd have to call to see if it's still available.

John

[NYsquarebird58]

Thank you! I checked the Bird's nest and Mac's, but didn't think to check Concourse. Hopefully the fact that it doesn't have a price doesn't mean it's discontinued.

[Tbird1044]

Marcelo:
Before you replace the vacuum advance, why not just do a quick test and see if it holds vacuum? You can also watch your point plate, by removing the distributor cap, to see if it is moving when you apply vacuum.
When you say the car is bogging down under load, does it feel like it is fuel starved? Could be several things: Fuel pump test for pressure and volume; Bad Power valve in carburetor. Plugged fuel filter or screen in gas tank.
My experience with Holley's is that the gaskets to the power valve would go bad, and then the power valve would stay open and cause the car to run rich to the point of fouling the plugs. Never had one hang in the closed position, but that is just me.
These are all some pretty easy things to check.
Nyles

[NYsquarebird58]

My fuel system is all new from the tank to the inline fuel pump just before the carb. I also have a Pertronix setup in my distributor.

[simplyconnected]

This is the kind of weather that is suited for carb rebuilding because you can do it inside. The carb is only held on by four nuts and two fuel lines.

ID your carb, check availability of kits, then take it off the car. I understand rebuild kits do not include power valves, and you want to order all your parts at the same time. Buy good carb cleaner. Brake cleaner doesn't do it.

So find a comfy, well-lit bench to work at, get your camera ready, and put the carb in a cardboard box. As you take the screws out, put them in trays or baggies and start taking pictures. At some point, you will know what parts are bad, so you can order them.

Pay attention to details, because there are parts that tend to fall out and you need to know where they came from and which way they go. Other than that, cleaning is straight forward. Don't spray your camera.

For cleaning the little tiny holes, and it's important you do, I strip stranded copper wire (like #12) and use one of the strands. Stranded copper wire is usually 19-strand so the strands get bigger as wire sizes get smaller. Copper is nice and soft; it won't change hole sizes. All you need is four inch pieces.

If dirt is in there, the wire will dislodge it as the carb cleaner breaks it down. That little red tube on the carb cleaner nozzle works wonders. Be prepared to be baptized by carb cleaner. - Dave

(BTW, pare your posted picture size down to 800px wide.)

[arizonajack]

Be prepared to be baptized by carb cleaner.

Or buy a 1 gallon or 5 gallon can of ChemTool carb cleaner with a strainer basket and soak your parts.

A lot less mess and the carb cleaner is reusable.

[YellowRose]

Carburetor Identification

Marcelo, Bob's Bird House in Delaware has a Distributor Vacuum Advance in used condition listed on their website for $65. I have nooo idea why they are asking that much for a used unit! Here is the link.

http://store.bobsbirdhouse.com/vacuu...sed-p2681.aspx

Mac's has two of them listed on their website, one for less than $25. That one has the same part # as in your picture below.

http://macsautoparts.com/distributor.../559/start/24/

First you need to find out if that unit is causing the problem or not. As Dave says, don't throw money at parts if you don't need to. Or something like that....