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Old 04-02-2004, 02:09 PM
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???about original specs on a holly carb jetting???

Thanks for all the help on my last thread, I looked up my original specs on my holly carbs, carb #0-9776 450 cfm and the jet sizes are throwing me off. it read that the front should have 582 jets,and the rear should have 134-6 jets i thought they was allways double numbers like 66-68 and so on..i tried calling the guy that worked on it, but cant get him at home.i wanted to get my old jets back so i can put it back to the original specs.before i put the 50cc pumps on.. could some one explane the numbers to me. I called the parts store and they said that i would have to get that from a performance shop which we dont have here.. and one more thing, i have never tried adjusting the idler mixture screws with a vacuum gauge, and now with 2 carbs i know i need to ask how does that work??or how to do that, i have always backed them out about a turn and a half and played with it,
thanks robbie

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Old 04-02-2004, 04:05 PM
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Here's a PDF from Holley with all the jetting specs, if the spec says 122-68...the last number is the jet size.

http://www.holley.com/HiOctn/ProdLine/CarbList.pdf

Do a search on the forum on "idle mixture", there are literally hundreds of threads on how to set idle mixture any number of ways.
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Old 04-02-2004, 06:33 PM
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Quote:
Originally posted by 4 Jaw Chuck
Here's a PDF from Holley with all the jetting specs, if the spec says 122-68...the last number is the jet size.

http://www.holley.com/HiOctn/ProdLine/CarbList.pdf

Do a search on the forum on "idle mixture", there are literally hundreds of threads on how to set idle mixture any number of ways.
I called summit racing and he said that the 582 jets are a special jet for that set-up but told me if i couldnt find the original jets to put 58 jets in and start from there, thanks for your help, im learning alot from asking--- Robbie
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Old 04-02-2004, 06:34 PM
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the 582 is a close limit jet used for emissions I think they flow somewhere in the neighborhood of 20 to 30 % less flow than a conventional jet.
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Old 04-02-2004, 07:20 PM
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Quote:
Originally posted by LilSmoke
the 582 is a close limit jet used for emissions I think they flow somewhere in the neighborhood of 20 to 30 % less flow than a conventional jet.
was the summit tech right by saying start off with a #58 jet??? he said that was close to the 582
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Old 04-02-2004, 08:18 PM
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The close spec jet is flow tested to be within a couple of % of the actual flow rating for that size, a regular size 58 jet is just fine. It's not like your going to pass any emission tests with a dual double pumper topped tunnel ram anyway.
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