C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Apr 5, 2006 | 04:13 PM
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Can anyone tell me the trick to adjusting the air/fule mixture screws on a holley carb? thanks!
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Old Apr 5, 2006 | 04:26 PM
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Reduce the idle first. Turn in one idle mixture screw until the engine almost stalls and then bring it back out about 1/4 turn until it smooths out, then do the same with the other. Some use a vacuum gauge, but it's not necessary. Return your idle to the preferred setting. The idle mixture screws are on the sides of the carb.
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Old Apr 5, 2006 | 04:27 PM
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I have the instructions at home. But as I recall it is: Start at 1 1/2 turns out. Attach a tach where you can see it. Then with the engine idling adjust each screw until the RPM peaks, then reset the idle screw.
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Old Apr 5, 2006 | 04:30 PM
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wow that was fast thanks for the info! what rpm do i want to do this at? sounds like your sayin bring it down to about 400 or 500.

I figure ill just hook up the timing light for a tach. digital read out, so i can get the highest rpm to the T.

when u say 1 1/2 out? does that mean all the way in, then back out a turn and a half, and then adjust it?

thanks alot!
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Old Apr 5, 2006 | 04:35 PM
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Originally Posted by Warnoffroad
when u say 1 1/2 out? does that mean all the way in, then back out a turn and a half, and then adjust it?
Yep. Good luck.
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