600 CFM Holley Idle Mixture Adjustments. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-29-2004, 02:16 PM
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600 CFM Holley Idle Mixture Adjustments.

I have a Holley 600 CFM carburator (i.e. P/N 0-80450).

What is behind the Idle Mixture plastic screws/caps?

Can I remove those plastic caps?

The reason I'm asking is that when moving them from one end to the other, it doesn't really make much difference. Would I be able to better ajust the Idle Mixture if I was to remove the plastic caps?

Thanks,
Daniel.

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Old 05-29-2004, 03:14 PM
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Yes remove the plastic caps as they have a internal limiter so you can only turn the screws so far.

You will get the full travel after you remove them and if you want just put them back on so it looks as though you didn't tamper with it.

That is if it matters to you.

Also as a side note some Holleys have reverse idle mixture screws meaning that when you turn them out you are actually leaning the idle instead of making it richer.

Last edited by Tmod; 05-29-2004 at 03:29 PM.
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Old 05-29-2004, 04:39 PM
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The ones with the caps are the reverse idle Holleys for sure. Intsead of adding more gas to the air/fuel mixture, they add more air. Those were on the 5.0 carbureted Mustangs and passenger cars.
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Old 06-01-2004, 10:36 AM
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Thanks, Tmod & lluciano77, I removed the plastic caps last night, it was really easy.

Thanks,
Daniel.
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