Intake Manifold:
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Heel & Toe
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Intake Manifold:
Hello Everyone from Shitty Ca. Got a dilemma hoping I can get some answers for. I'm sure this question has been asked before many times. Getting read to drop a 383 in my 73 Corvette. I am currently running a Weiand 8000 intake manifold. I would like to move towards an Eldelbrock 7501 but because of the height change I'm not sure the hood would close. Running a 750 Holley. I suppose a skinny air cleaner would help in solving some of the problem. I do have a 3" cowl on my hood. The Weiand I have now has a Carb Pad Height of 3". The Eldelbrock is 4.725" which is quite a bit of difference. That would bring me up 1.725" For some stupid reason I can't figure out if it would work or not. What do you guys think? Thank you for your time: Charles
Last edited by h82stop; Oct 17, 2019 at 06:40 PM. Reason: forgot a detail
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Welcome to the forum! Try asking your question here.
https://www.corvetteforum.com/forums...performance-3/
https://www.corvetteforum.com/forums...performance-3/
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I had a 73 with bbc. They are two inches taller then sbc. I was able to use a high rise duel plane on it with a for the time period 14 inch factory drop base air cleaner. So you will not have any problem with the sbc unless your goal is to keep a factory air cleaner that came with the cowl hood. I will trade you some shity Texas weather if you have some so-cal weather to trade. It's to hot or to cold or it's raining take your pick.
Last edited by Little Mouse; Oct 17, 2019 at 09:16 PM.
Pro
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From: Jarrettsville Maryland
I'm not sure the difference in performance would really be noticeable. In this dual plane manifold shootout (https://www.hotrod.com/articles/dual...d-comparisons/) the difference in numbers between the short manifolds (they didn't specifically have a Weiand 8000, but did have some other Weiands) and the medium manifolds (including the RPM Air Gap) was around 10 lb-ft and 10hp.
I was running an Edelbrock RPM 7101 with a stock air cleaner on an Edelbrock carb and it cleared the stock hood on my 79 just fine. The carb height, according to that shootout, is 0.01 inches shorter than the RPM Air Gap.
I decided I wanted to use a Quadrajet and get my EGR working (or at least looking functional), so I now run the ZZ4 intake. The difference in HP/TQ numbers between the ZZ4 and the RPM intake I was using (and the RPM Air Gap) are almost negligible. My engine now has all of the stock Qjet, EGR, air cleaner, etc, but everything below the intake is performance upgraded.
I did take a look at the Weiand 8000. It looks a lot like the Edelbrock Performer and ZZ4 intake. The carb height for the Performer (which is considered a stock height replacement), according to that shootout, is 4.60 inches, and the ZZ4 carb height is 4.95. Are you sure the Weiand 8000 carb height is only 3 inches?
I was running an Edelbrock RPM 7101 with a stock air cleaner on an Edelbrock carb and it cleared the stock hood on my 79 just fine. The carb height, according to that shootout, is 0.01 inches shorter than the RPM Air Gap.
I decided I wanted to use a Quadrajet and get my EGR working (or at least looking functional), so I now run the ZZ4 intake. The difference in HP/TQ numbers between the ZZ4 and the RPM intake I was using (and the RPM Air Gap) are almost negligible. My engine now has all of the stock Qjet, EGR, air cleaner, etc, but everything below the intake is performance upgraded.
I did take a look at the Weiand 8000. It looks a lot like the Edelbrock Performer and ZZ4 intake. The carb height for the Performer (which is considered a stock height replacement), according to that shootout, is 4.60 inches, and the ZZ4 carb height is 4.95. Are you sure the Weiand 8000 carb height is only 3 inches?
Dr. Detroit
Joined: Mar 2012
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From: New Braunfels Texas
It should fit if you have a 3" cowl.....the 7501 will fit under a 73 hood with a drop base air cleaner and 3' element.
The 8000 series Action Plus manifold won every manifold contest for dual planes in the 80's......it was the go-to manifold.....nice big plenum transition to the runners. Mill the divider down 2" long and 1" down and it works even better on a 400 horse engine.
I like all of the Air Gap stuff though because you can hide lines, wires, hose underneath it.
Jebby
The 8000 series Action Plus manifold won every manifold contest for dual planes in the 80's......it was the go-to manifold.....nice big plenum transition to the runners. Mill the divider down 2" long and 1" down and it works even better on a 400 horse engine.
I like all of the Air Gap stuff though because you can hide lines, wires, hose underneath it.
Jebby
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The problem with using intakes with high pad heights is hood clearance. So to overcome that issue, you need a drop base air cleaner. But this brings the air cleaner lid closer the the carb flange. So even though a 3" air cleaner can be used, you now have a choke point for air entering the carb. Above all else, that engine needs to breathe freely. My solution was to use a Team G single plane intake with a low pad height. This intake out performs the beloved RPM air gap at the top end and only loses a few pounds of torque at the lower end. But, I can run a 4" tall air filter which lets the engine breathe a lot more air. Imo, this more than compensates for the dual plane design vice single plane and I don't have any under hood fitment issues. You have a 383. You didn't buy it for fuel economy. Let that sucker breathe like its supposed to!
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
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From: New Braunfels Texas
The problem with using intakes with high pad heights is hood clearance. So to overcome that issue, you need a drop base air cleaner. But this brings the air cleaner lid closer the the carb flange. So even though a 3" air cleaner can be used, you now have a choke point for air entering the carb. Above all else, that engine needs to breathe freely. My solution was to use a Team G single plane intake with a low pad height. This intake out performs the beloved RPM air gap at the top end and only loses a few pounds of torque at the lower end. But, I can run a 4" tall air filter which lets the engine breathe a lot more air. Imo, this more than compensates for the dual plane design vice single plane and I don't have any under hood fitment issues. You have a 383. You didn't buy it for fuel economy. Let that sucker breathe like its supposed to!
I also run the Team G on a 406........hell of an intake.....works everywhere and loves a big cube engine. Consider it especially if you have a 4 speed or an Auto with a stall.....
Jebby
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It will fit a 3" cowl just fine. Theres drop base air cleaners in case
Dig the teamG and older weiands also they work.
Like afrs new cast intake but for almost 500 bucks cant see where it would be worth it.
Dig the teamG and older weiands also they work.
Like afrs new cast intake but for almost 500 bucks cant see where it would be worth it.
Last edited by cv67; Oct 18, 2019 at 10:45 AM.