Holley carb users, advice needed!!!
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Senior User
Joined: Dec 2014
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From: spokane
Just realized that I do have a spring in my vacuum secondary (didn't pay attention to which color but it was what looked like a medium stiffness based on pictures). For some reason I was thinking the spring was supposed to be out side of the housing for the diaphragm. Sorry for the misinformation. This was only my second carb rebuild (first holley and first 4bbl rebuild) so still learning vernacular and what not.
Hotshot
Joined: Feb 2004
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From: The Shenandoah Valley
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Joined: Dec 2014
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From: spokane
Brand new diaphragm, I was just being dumb lol. Didn't realize the spring inside the housing was the spring I thought I was missing... Just a dumb moment or two.
Laughing Gas
Joined: Apr 2016
Posts: 858
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From: Buffalo NY
This carb is an 1850, correct? If it is, factory specs: primary main jet -65. Secondary metering plate- #9. Power valve- 6.5. Pump nozzle - .025. Remember,this carb was on a chevy,so it must be brought back up to the higher performance standards of a FORD.
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From: spokane
Number on the horn is 80457-S so maybe? I don't know specifically. That should at least be a good starting point though I would imagine.
Cargo Master
Joined: Nov 2009
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From: starship enterprise
Well, the stumble is from either lean or rich, momentarily. So, I presume that the shot of gas is either running out before the primary is pulling through the venture or the primary pulling and the extra gas is too much, cams never made much difference to me, position did though. does the rpm flash up then die off then roar back or does it stumble, sputter, then roar up? Make a change in some manner to give a longer, more even shot and see what happens, it should get worse or better, that will tell you which way to go. Another issue is lookto see how far open the secondaries are at idle. If the transition circuit is exposed, then you are pulling gas there all the time, meaning the pump needs to try to compromise for that extra from idle, meaning usually a rich condition. The other thing that Ihave had cause this was a bad check valve in the pump, either the ball holding the fuel up at the nozzle is bad or the check valve in the float bowl are bad, or both. Checkthese things, with the biggest accelerator pump known to man it wont work like that.
More Turbo
Joined: Sep 2016
Posts: 559
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From: Australian Outback
Here you go, this has a listing of all parts inside under the 'Parts & Kits' tab:
https://www.holley.com/products/fuel...parts/0-80457S
- boingk
https://www.holley.com/products/fuel...parts/0-80457S
- boingk
Senior User
Joined: Apr 2004
Posts: 235
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From: Fayetteville, NC
What's your timing at? Give it more idle timing and see if the bog goes away. If the vacuum advance is hooked to ported vacuum you can switch to manifold vacuum as a test too, that will bump the timing higher at idle speed but otherwise it'll be stock.
The transition slot needs to be squared up too. If too much slot is sho you'll get a bog. Look it up online, there's tons of pictures.
Remember the old saying goes: 90% of carburetor problems are in the distributor
The transition slot needs to be squared up too. If too much slot is sho you'll get a bog. Look it up online, there's tons of pictures.
Remember the old saying goes: 90% of carburetor problems are in the distributor
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Hotshot
Joined: Feb 2004
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From: The Shenandoah Valley
Timing ..... mine does great with a aftermarket quick advance kit installed, vacuum run to ported on carb, and to set timing I disconnect vacuum, plug port, speed engine up to where advance stops which is pretty quick, and set at 35 degrees BTDC .... then just reconnect vacuum and remove timing light. In high vacuum it can advance way past 40, but on a pull, it's only centrifugal.
I marked HB to 40 degrees years ago. I have tried straight manifold vacuum but I get pinging at times, seems happiest with ported.
New one on me ..... but I get it!
I marked HB to 40 degrees years ago. I have tried straight manifold vacuum but I get pinging at times, seems happiest with ported.
New one on me ..... but I get it!
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