Holley carb id gasket kit

[Thedeputy]

After sorting out the cam in my 440 I now need help identifying my holley carb.
It has an issue with the ported vacuum. There is a nipple on the passenger side front metering plate but there is no ported vacuum on that connection. For now I have the distributor advance connected to the manifold vacuum but I would like to get it to a ported vacuum port.
Therefore I want to take it apart. Where can I get the correct gasket kit for this carb, and what kind if holley is it?

See pics. It's a single pumper four barrel without choke tower (not machined away but never been there) and vacuum secondaries. The only number I could find, 51573, says it's a 750 cfm.
Could it be that being a chokeless carb that explaines the lack of ported vacuum?

Thanks,

Antoon

 

[HALIFAXHOPS]

Try here

http://www.carburetor-parts.com/Holley_c_26.html

 

[mentor70]

your better off running manifold vacuum, thats how it was done before the days of the smog.

buy you need you get your distributor recurved and the the vacuum advance in the distributor dialed in for proper operation.

i would also suggest getting the Quick fuel overhaul kits instead of Holleys, the gaskets hold up to removal and tuning better than Holleys, and the power valves are of a 4 port design VS Holleys 2 port design.

 

[Thedeputy]

Thanks for the tips.
About the vacuum advance; I'm just following advice from mopar actions Rick Ehrenberg. I forgot to mention that the car is only street driven. No racing. Therefore I'm looking for good driveability, reliability and decent mileage.
That's why I think the ported vacuum is the way to go. Why else would ma mopar have done it this way when these cars were new?

Any idea on why the carbs ported vacuum nipple has no vacuum at all?

Thanks for the help,

Antoon

 

[mentor70]

that fitting on the side of the carb with have very little if any vacuum at idle, it will send a signal as the velocity of air moving through the carb increases. the advice you have received seems flawed to me.

you will have a cleaner burn and more efficient running car with manifold vacuum, but if your using a Mopar Performance electronic dist. they are known to have issues with the advance plates.

i have an FBO igntion kit, with reworked dist, it runs around 46* total timing. 12* on the vacuum with 10 inches and up off the manifold and 16* mechanical with 18* initial.

thing to remember is at WOT all the vacuum advance disappears, which leaves me at around 34* when its under max load.

this is the ideal setup for a mostly street car. this will keep your engine running cooler VS running ported vacuum.

 

[Thedeputy]

Aha I see. I was under the impression that you calibrate the dsitributor with no vacuum attached to be at about 34-35 degrees full mechanical advance @ 3000 rpm. Then rework the distributor so it starts and idles well with about 12 degrees of advance. If you then hook up the ported vacuum there is indeed no vacuum signal at idle, so the distributor does not advance any more. Total timing at cruise should the be around 50 degrees.
I have an original 74 440 distributor which I inspected and cleaned with a vacuum advance that advances 8 cam degrees. The mechanical and vacuum advance mechanismes in the distributor work fine.

Have I perhaps been misinformed?

Thanks for your wisdom.

Antoon

 

[Thedeputy]

I'm sure this subject has been talked about lots of times. Maybe this article will clear the confusion some more. It matches mentor70's advice.
http://www.gofastforless.com/ignition/advance.htm

But now, still not sure what kind of holley I have. Any tips?

Thanks,

Antoon

 

[mentor70]

your carb looks like its a Heinz 57.

the center throttle body looks like a "Proform" piece to me.

pretty much any Holley style 4150 kit will work

 

[Thedeputy]

That explains why there aren't any numbers on it. It might also explain the ported vacuum issue. Being a proform main body it probably doens't have an orifice drilled just above the throttle blade to supply the ported vacuum signal. With the holley metering plates still having the nipple it just connects to nothing.

I'll chech out the quick fuel gaskets and get on with it.

Thanks again,

Antoon