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Old 06-21-2017, 09:27 PM
Channing Spencer Channing Spencer is offline
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Default Dual Quad Question

Does anyone know why the carb intake holes are linked on this Dual Quad manifold?

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Old 06-21-2017, 10:38 PM
Paul Steinberg Paul Steinberg is offline
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I would guess that it is to balance the fuel delivery. What do the carburetors look like. When dealing with aftermarket parts, when you have a question like this, then it is best to ask the manufacturer what they had in mind.
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Old 06-21-2017, 10:54 PM
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Mix the file and air to keep from running raw gas into the cylinder. The problem with all this stuff is it's made for high RPM.
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Old 06-22-2017, 12:42 AM
Channing Spencer Channing Spencer is offline
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Quote:
Originally Posted by John ED Renstrom View Post
Mix the file and air to keep from running raw gas into the cylinder. The problem with all this stuff is it's made for high RPM.
Good point about the high RPMs. It looks cool under the hood, but the 390 is not exactly a high revving engine. They were offered from the factory with dual quads though. I was wondering if it would wake up the engine a bit.
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Old 06-22-2017, 12:47 AM
Channing Spencer Channing Spencer is offline
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Quote:
Originally Posted by Paul Steinberg View Post
I would guess that it is to balance the fuel delivery. What do the carburetors look like. When dealing with aftermarket parts, when you have a question like this, then it is best to ask the manufacturer what they had in mind.
I believe this intake is made for Carter Wcfb carbs. The manifold fits a Cadillac 390.
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Old 06-22-2017, 08:30 AM
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Kurt Arends Kurt Arends is offline
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I owned a '59 Cadillac Series 62 6-window sedan with a factory installed triple deuce set up in the early '80s. It would have been a factory option on anything other than the El Dorados. The triple deuce was only stock equipment on the '59/'60 El Dorados.

I am not aware of dual 4 bbls having been factory installed on any of the 390s('59 & after).
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Old 06-22-2017, 08:47 AM
Paul Steinberg Paul Steinberg is offline
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From my memory, they offered the 3 deuces in one year, and the dual quads the following year, and alternated back and forth. I don't believe that either was a popular option.
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Old 06-22-2017, 11:27 AM
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On has to remember how the 4 barrell carb works. It runs off the front two and the back opens up on demand. The cross pattern is what feeds each cylinder in Either mood. But on this one each carb only feeds 4 cylinders. That is the rubber. Keeping half the engine from running to lean or to rich. It makes for daily driving a problem. You fight it all the time driving it around town.
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Old 06-22-2017, 05:44 PM
Peter Grave Peter Grave is offline
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Folks the manifold is a Weiand (speed part) not GM. Two fours were on the Eldorodo in 55 and I think 56. Cadillac did the three two deal but dropped it in 61 due to service issues.
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Old 06-22-2017, 09:28 PM
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Quote:
Originally Posted by Peter Grave View Post
Folks the manifold is a Weiand (speed part) not GM. Two fours were on the Eldorodo in 55 and I think 56. Cadillac did the three two deal but dropped it in 61 due to service issues.
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I believe this intake is made for Carter Wcfb carbs. The manifold fits a Cadillac 390.
No one ever said it was a GM part, and it is kind of difficult not to notice the name of the manufacturer in the middle of the manifold.
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