Carburetors in general, Holley's in particular; AKA Carb Tech

[Lindel]

In light of the large number of questions concerning carbs lately, I've been doing some searching for tech info.

Holley's website contains a lot of information and tech advice for the browsing.

http://www.holley.com/TechService/Library.asp

This page in particular give links to info on cams, carbs, fuel injection, pistons, etc.

Edelbrock also has a tech site. http://www.edelbrock.com/automotive_...ll/index.shtml

Hope this helps some folks out.

[Kristy]

Thanks!

Thanks for the info! Very helpful!....Some of my parts are missing too!

[fulsizjeep]

Ristow's Excellent MC4350 Rebuild

http://www.ifsja.org/forums/vb/showthread.php?t=80329

[bufurd]

carb. info.

.Q-jet great read. florida4x4.com/tech/quadrajet/qtune.pdf

[kenny kustom]

Whats the recomended fuel pressure for a mc 4350 ?

[Lindel]

5 to 7 psi would be more than adequate.

[kenny kustom]

so my 7 psi is okay then ?

[Lindel]

It's on the high side, but if it's been running ok I wouldn't worry about it.

Where are you measuring it at, that could make a difference.

[kenny kustom]

Where are you measuring it at, that could make a difference.

At the carb. From my regulator. With the motor off.

[Lindel]

As long as you're not having flooding issues, then you're probably ok. If it starts flooding then you'll need to drop the pressure some.

[cajun_lad]

What are the gains/losses of vacuum secondaries vs. mechanical?
The reason I ask is I rebuilt my Holley TA yesterday and my dad pointed out that it would be real easy to convert from vacuum to mechanical and went on to ramble about how he hated vacuum secondaries... blah, blah, blah. Should I take his advice, or leave well enough alone?

[Lindel]

Stick with vacuum secondaries. The reasoning is that they'll only open when the engine load demands more fuel/air. With mechanical secondaries, they'll open at WOT whether they need to or not.

Mechanical secondaries are almost exclusively a high performance item, not the best application for a 4x4.

[toyjeep]

I have a Holley Truck Avenger with electric choke that seems to run pretty good.

The problem I have is it will not idle down completely after it has been running a while. I can tap the throttle and it will idle down, but it will not do it on its own when I let off the gas, like at a stop light.

Any ideas what is causing this?

[HOOT]

Guess I should look at the "Stickys" posts more often..

I've been beating my head for info on my Holley carb the last 2 days. No catalogs match my numbers.Today I go seek someone recommended by 3 of the 5 car parts stores I've been to in the last 2 days. I think I'll leave it with him and have him rebuild it.
I even seen one catalog that had the "specialty builds" listed by who they were for and what the did with them.ie.Driver's name/what style carb/jets/circle track racer... Still no numbers match. Did I get a carb that was heisted fom the plant piece by piece like that Johnny Cash song about the Caddy.

I'll try to remember to ask him about your idle problem.

[Lindel]

toyjeep, Most likely the return spring isn't quite stiff enough, or you've got some binding in the throttle plate shaft.

Hoot, check the links I left in the first post, one should take you to where you can call the Holley tech line. Give them the info on your carb and see if they can't help you.