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Old 09-14-2019, 12:46 AM
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Holley Carb

Are new Holley carbs calibrated out of the box?

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Old 09-14-2019, 07:29 AM
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Yes. Not a guarantee it will be perfect, but usually close.
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Old 09-14-2019, 10:36 AM
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Holley publishes a plethora of tuning information. Plus, the internet is loaded with info.......
https://www.google.com/search?q=Holl...hrome&ie=UTF-8
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Old 09-14-2019, 11:12 AM
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Quote:
Originally Posted by Bullit Cap View Post
Are new Holley carbs calibrated out of the box?

Different model and part numbers have different calibrations based on some averaged conditions of their expected use. This should be enough to get up and operating but unless you built the exact engine and vehicle configuration and operate in the same environmental considerations that Holley (or Edlebrock for that matter) calibrated to, you will need to do some tuning.


The calibration needed by a stock replacement carb is far from a race requirement. The calibration in Los Angeles is much different from Denver. So one size of calibration does not fit all and they have no way of knowing where a production carburetor will end up.


In simple terms, the carburetor will not come calibrated for you unless you buy it from a tuner shop and supply them with your specifics. That costs extra on top of buying the carb itself.



Bogie
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Old 09-14-2019, 11:49 AM
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I can tell you right out of the box the holley 600 cfm vacuum secondary carburetors such as the model 1850 manual choke or 80457 electric choke is calibrated pretty lean and is more for stock small blocks to really mild cams in the [email protected] or less duration and also the 570 and 670 street avengers will fit in the same category and will be very close in calibration.

The holley 750 cfm 3310 manual choke or 80508 electric choke and 770 street avenger vacuum secondary carbs are calibrated much richer vs the 600/670 vacuum secondary carbs are more for bigger cubic inch engines and also work close out of box with bigger performance cams but not over radical but are richer and more for performance vs the smaller cfm vacuum secondary carbs.

Now on holley double pumper carbs from the 600 all the way to there 850 cfm they are much more richer out of the box and are calibrated more for performance engines and for bigger cams and less for mileage and more for less daily driver type of a deal.

Now on to the quick fuel brand carbs many of them out of the box regardless from 600 cfm up to there 850 plus cfm carbs regardless of they are vacuum secondary or double pumpers they are setup much richer compared to a similar holley and are similar in setup to the double pumpers and are more oriented for performance then mileage but all of them within reason can be tuned and re calibrated for performance and mileage depending on the build and also what use your vehicle is going to used for.

Also transmission type and if an automatic transmission is used then a proper stall converter and also rear gearing and several other things will effect the carburetor selection and the size needed for what your wanting out of your ride. Also you need to have the proper matching of parts such as cylinder heads and compression and also a cam that is matched up to the heads and the rest of the build from the engine on back.

Just throwing on a carb out of the box in most cases will need to be tuned and things changed even on bone stock builds depending on what carb regardless of holley or holley clones or a Q jet or edelbrock none is ready out of the box regardless of what they market.

I have many books on holley carbs and I have written down my own library on what they all are out of the box and use that for reference for trying to help people tune there holley carbs with what they have and I have a lot of notes and stuff on many forums I have read on over the years on many engine combos and what they ended up with on there final tunes to give me ideas on a ball park starting point for tuning and what is a good starting point.

There is a lot more to it then just turning some screws which they never market that.
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Old 09-15-2019, 04:22 PM
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As a general token, Yes.

Quote:
Originally Posted by Bullit Cap View Post
Are new Holley carbs calibrated out of the box?

If you are purchasing it from an individual, it can be more unpredictable as to what you're getting. See, when you get it online or another retail outlet, they ask you the exact specifications of your vehicle to optimize your results. However; I purchased a quadrajet for my big block el camino for $100 new in the box, only because the fellow had gotten it for a 396 camaro & I knew that'd be pretty close to what I needed. I did have to tweak it a bit with a vacuum gauge to make it run tip-top. So as long as you know what you got.
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Old 09-19-2019, 10:34 AM
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A few comments here, in hoping you'll pick up at least one tidbit.

The last two Holley VC carbs I used were the 80783C 650cfm and 80457SA 600cfm. In addition to idle mixture, both needed float level adjustments.

The 80457, which I still have on a mild 355, likes an 8.5 power valve instead of the 6.5 it came with. The engine makes around 19" vacuum at idle, so now the valve opens at 8.5" vacuum instead of 6.5". The carb also likes slightly larger squirters. Not very scientific, but I simply drilled out the holes a few thousands with a micro drill. I think stock was .031", now they are .035" as I recall.

I played with primary jets on both carbs, and eventually went back to "out of the box" sizes.

Just remembered that on the 650 I cracked open the rear butterflies a tiny bit to get a better range of adjustment with the idle mixture screws. That's been a while, so I don't remember the specifics. The engine was a 327 with 15-16" idle vacuum, so that surely had something to do with it.

All that said, I am not racer or or carb specialist, but I do fiddle around with tuning out stumbles and improving responsiveness to my right foot.

BTW, that 80783 650cfm carb is probably my all-time favorite Holley. I have to admit that's partially due to its classic looks and finish. Liked it much better at the price I paid around 10 years ago -- $267 on Amazon!
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Old 09-19-2019, 12:49 PM
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holley Carb

I called AED, they use Holley Carb then add their own metering blocks.

You can call them , see what they suggest then order from Summit if they don't have to customize.

I just put their 750 DP on my 502 , worked right out of the box

https://www.aedperformance.com/compe...iAAEgLPYPD_BwE
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Old 09-19-2019, 01:37 PM
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Are new Holley carbs calibrated out of the box?

NO !! They are not!

Bogie is right

Carbs are wet flowed and calibrated for an average (picked years ago) for a sea level elevation , 70 degree f. temp and an average manifold vacuum!
They need to be tuned for your specific elevation and engine vacuum demand , they will need calibration ( tuning )for your cruise and WOT power mixture both jets and power valve (If you run one power valve or even 2)! Sure some are lucky and bolt on a carb and it performs reasonably well and some people are satisfied with that But I have never seen any carb out of the box perform to its full potential without tuning and calibrating it, on stock or performance engines!! !

Holley carbs are calibrated for sea level operation and an inlet air temperature of 70 degrees Fahrenheit. Once you know the correct stock jetting for your particular Holley carb, you can determine whether you live at an altitude above sea level and need a jet change. a change in the carb's inlet air temperature may require a change in the jet size from the stock calibration also. So your area of what ever part of the world were you live drive or race is very important to your engine and carbs tuning and calibration even a change in design of a different air cleaner can change your carbs tuneing needs!!

Jester

Last edited by painted jester; 09-19-2019 at 01:56 PM.
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Old 09-19-2019, 01:43 PM
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Quote:
Originally Posted by BogiesAnnex1 View Post
Different model and part numbers have different calibrations based on some averaged conditions of their expected use. This should be enough to get up and operating but unless you built the exact engine and vehicle configuration and operate in the same environmental considerations that Holley (or Edlebrock for that matter) calibrated to, you will need to do some tuning.


The calibration needed by a stock replacement carb is far from a race requirement. The calibration in Los Angeles is much different from Denver. So one size of calibration does not fit all and they have no way of knowing where a production carburetor will end up.


In simple terms, the carburetor will not come calibrated for you unless you buy it from a tuner shop and supply them with your specifics. That costs extra on top of buying the carb itself.



Bogie

And then when installed will still need some tweeking LOL

Jester
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