Staggered jetting - Chevelle Tech
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post #1 of 7 (permalink) Old Apr 26th, 19, 7:57 AM Thread Starter
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Staggered jetting

Does anyone know of any dyno tests comparing staggered jetting to conventional jetting with a 4781 on a bbc with a hogged out 163 intake. Right now I’m at 77’s in the front with 84’s in the rear. It seems ok but curious if gains are to be made.
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post #2 of 7 (permalink) Old Apr 26th, 19, 10:35 AM
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Re: Staggered jetting

I would say all are staggered. What is with the hogged out intake?
You need to supply much more info about your entire setup.


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post #3 of 7 (permalink) Old Apr 26th, 19, 1:07 PM Thread Starter
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Re: Staggered jetting

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Originally Posted by mrpaticular View Post
I would say all are staggered. What is with the hogged out intake?
You need to supply much more info about your entire setup.
I should have said 163 intake with plenum divider removed. According to my old "How to Hotrod Big-Block Chevys, it suggested left front 80, right front 76, left rear 76, right rear 78, as a starting point, for dual plane intakes with no divider.
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post #4 of 7 (permalink) Old Apr 26th, 19, 1:36 PM
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Re: Staggered jetting

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Originally Posted by aimhard View Post
I should have said 163 intake with plenum divider removed. According to my old "How to Hotrod Big-Block Chevys, it suggested left front 80, right front 76, left rear 76, right rear 78, as a starting point, for dual plane intakes with no divider.
I remember reading that book and thinking of doing that with mine. Remind me, the factory Holley had little tabs on 2 of the 4 venturi....were they also staggered jet or was that in place of staggered jet? I would think if you removed the plenum divider, staggered jets would have not effect.
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post #5 of 7 (permalink) Old Apr 27th, 19, 8:10 AM
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Re: Staggered jetting

I misunderstood your idea for staggering. Think about it. With no divider, the fuel/air goes into the intake and goes where the vacuum is. Staggering not effective on left and right jets. But absolutely is effective front to rear. Jetting depends on usage.


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post #6 of 7 (permalink) Old Apr 27th, 19, 8:59 AM
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Re: Staggered jetting

I'm not familiar with a 4781.
Are you running a power valve?

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post #7 of 7 (permalink) Old Apr 27th, 19, 10:08 AM Thread Starter
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Re: Staggered jetting

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Originally Posted by bradley67 View Post
I'm not familiar with a 4781.
Are you running a power valve?
Yes a 6.5 power valve. The book says the staggered jetting recommendation allows equal amount of fuel to all cylinders.
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