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Old 01-27-2008, 08:03 PM   #1
butterfly effect
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I just fitted a zz383 gm performance engine. The carb that I used is a holly double pumper 4150 series pn 0-82751 , 750 . What jets and power valve should I start with? I also used their single plane intake.
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Old 01-27-2008, 09:24 PM   #2
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You are in the wrong section, this is Help for problems with the forum, like posting pics etc...
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Old 03-26-2008, 12:50 AM   #3
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I have the same problem....383 with a Barry Grand 750 Mighty Demon. I know the engine is running rich so I will just get one of those jet kits from Summit or Jegs and start installing smaller ones until it runs right!
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Old 03-26-2008, 03:14 AM   #4
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Quote:
Originally Posted by WWK888 View Post
You are in the wrong section, this is Help for problems with the forum, like posting pics etc...
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Old 03-26-2008, 04:10 AM   #5
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Quote:
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Why are you rolling your eyes at me? When the op first posted this it was in the Help section (like in help with posting pictures etc...).

Obviously a mod moved this thread to the proper section after my suggestion.
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Old 03-27-2008, 01:49 AM   #6
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Carb jetting is usually pretty close. Make changes 2 steps(jet sizes) at a time; 1 step probably wouldn't show enough difference to evaluate. After you figure if you need to go richer or smaller, you can fine tune to 1 jet size.

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Old 03-27-2008, 09:54 AM   #7
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Quote:
Originally Posted by butterfly effect View Post
I just fitted a zz383 gm performance engine. The carb that I used is a holly double pumper 4150 series pn 0-82751 , 750 . What jets and power valve should I start with? I also used their single plane intake.
Normally out of the box most carbs are somewhat close for a moderate engine at sea level. The holley web site just like the Demon web site has the base line settings.

the ZZ383 and a single plane would probably use a 6.5 PV. single planes need an instant squirter. So set the squirters for instant action.
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