392 hemi 2x4 manifold

Posted By: B1arno

392 hemi 2x4 manifold - 08/24/13 02:48 AM

OK, so I have my single four barrel setup for sale and am going with two fours. Not a lot available for a 392 Hemi. A Weiand 7263 dual plane good from 2,000 rpm to 6,800 rpm, and the Hot Heads single plane good from 2,800 to 7,800. I have a good idea what I think will work best for what I want the car to do but I would appreciate some input from you guys.

The car is a 34 Dodge Highboy coupe, 392 Hemi, 4 speed, 3.23 gears, and full lenght headers. It has 10 to 1 comp, and a Howards .459 lift, 280 duration cam.

It will be completely street driven with an occasional cleaning of the combustion chambers. It will never see 7,000 rpm. The only reason I am thinking of possibly using the Hot Heads intake is because the car has a 4 speed and would tolerate the single plane better than an auto would.

Any thoughts?

Arno

Posted By: dart4forte

Re: 392 hemi 2x4 manifold - 08/24/13 05:03 AM

If you think thats bad try finding parts for a 241 hemi

Posted By: TrWaters

Re: 392 hemi 2x4 manifold - 08/24/13 03:11 PM

Actually, in EMC dyno testing, the single 4 HH intake you are selling (with calibrated carb) made better power than each of the others you listed.

Posted By: B1arno

Re: 392 hemi 2x4 manifold - 08/24/13 03:37 PM

I've been told that before. I don't doubt it but would love to see the numbers if anyone has them or knows where to find them. Is the differrence 5hp or 30hp. To me a Hemi just looks naked with one four barrel on it.

Posted By: B1arno

Re: 392 hemi 2x4 manifold - 08/24/13 03:38 PM

Quote:

If you think thats bad try finding parts for a 241 hemi

You got me there!

Posted By: B1arno

Re: 392 hemi 2x4 manifold - 10/01/13 12:15 AM

I decided to go with the Wieand dual quad manifold. I've got it up and running on the car with a pair of Edelbrock 500 cfm carbs. I was trying to figure out what to run for an air cleaner. I looked at a lot of air cleaners that are made for dual quads and nothing jumped out at me. Then I thought of a couple of velocity stacks with the foam filter but the carbs are to close together. So I picked up a couple of 6 1/2" diameter air cleaners. This is the setup I will probably run most of the time. I then found a scoop from a boat at a swap meet and decided to pick it up for $20. I modified the base to fit my carb spacing and will run this setup to change things up from time to time. It's a bit over the top but then so are the rear tires! What do you guys think? Too much?

First pic is the air cleaners. Second is the scoop.

Attached picture 7870990-AirCleaners.jpg

Attached picture 7870990-AirCleaners.jpg

Posted By: B1arno

Re: 392 hemi 2x4 manifold - 10/01/13 12:15 AM

scoop

Posted By: moparx

Re: 392 hemi 2x4 manifold - 10/01/13 01:13 AM

i like the boat scoop my self.

Posted By: 80arrow

Re: 392 hemi 2x4 manifold - 10/01/13 01:23 AM

Me to (the boat scoop)

Posted By: Mopar Ron

Re: 392 hemi 2x4 manifold - 10/01/13 02:21 AM

Quote:

i like the boat scoop my self.

"ME TOO"

Posted By: Hemi Allstate

Re: 392 hemi 2x4 manifold - 10/01/13 02:23 AM

I like them both Arno!!!
That was a real good deal on that boat scoop too!

Mark

Posted By: B1arno

Re: 392 hemi 2x4 manifold - 10/01/13 03:16 AM

Thanks guys! I do like the boat scoop better myself, I just thought it might be to much. The good news is that the two small air cleaners fit inside the scoop!

Posted By: 62maxwgn

Re: 392 hemi 2x4 manifold - 10/01/13 03:32 AM

I'm the other way,think the boat scoop looks like a mail box but that's just me !!

Posted By: poorboy

Re: 392 hemi 2x4 manifold - 10/01/13 03:42 AM

Sure the scoop is big, but it matches the rest of the car

I'd go for the scoop on that car, it just looks right. Gene

Posted By: 5wndwcpe

Re: 392 hemi 2x4 manifold - 10/01/13 04:05 AM

Maybe tape off some stripes and blast it to match the valve covers.

Posted By: John_Kunkel

Re: 392 hemi 2x4 manifold - 10/01/13 06:13 PM

I prefer the oval billet AC.

Attached picture 7872236-EngLS.jpg

Posted By: B1arno

Re: 392 hemi 2x4 manifold - 10/02/13 03:45 AM

Quote:

I'm the other way,think the boat scoop looks like a mail box but that's just me !!

HaHa! It kinda does.

Posted By: B1arno

Re: 392 hemi 2x4 manifold - 10/02/13 03:52 AM

Quote:

I prefer the oval billet AC.

I liked this one too but didn't feel it went with the rest of my car. It looks like you have the four barrels on progressive linkage. Is that right and how does it work with that manifold? I wouldn't think it would get even fuel distribution.
Arno

Posted By: John_Kunkel

Re: 392 hemi 2x4 manifold - 10/02/13 05:05 PM

Any 2 X 4 setup is gonna get better fuel distribution with straight linkage but most factory setups were progressive; running the rear carb as the primary. In my case, there was less throttle response with the progressive.

Posted By: scottyb1955

Re: 392 hemi 2x4 manifold - 10/03/13 03:20 AM

Hot Heads is the place for old hemis

Posted By: BigBlockMopar

Re: 392 hemi 2x4 manifold - 01/13/14 01:24 AM

I've had a dual 4 on my 354 Chrysler poly engine for a short while.
Was an upgrade from a single 2-bbl intake.
Had some trouble with one of the carbs so I had to change to a single stock 4-bbl 392 Hemi intake instead.

I have a 392 in the works that will receive the dual 4 intake instead.

Posted By: B1arno

Re: 392 hemi 2x4 manifold - 01/13/14 01:37 AM

What problems were you having? I've been trying to get my setup dialed in because it has been way rich. I've leaned it one jet size and two rod sizes and am going to go another jet size. I'm running Thunder series 500s.

Arno

Posted By: BigBlockMopar

Re: 392 hemi 2x4 manifold - 01/13/14 01:45 AM

I had backfires out of the front carb occassionally.
At first I thought it was because of my homemade linkage but I was able to rule that out.
After I had removed the carbs and intake again I somewhat recalled one of the carbs has been used as a test carb on a bad running engine and it got a few nasty backfires aswell there.
Maybe the throttleshaft is slightly bent or it has other issues. I haven't been able to find out anymore on this intake.
I hope I will know when it's installed on the 392 in the future.

The carbs were 625 Carters by the way.
Way too much for a 354ci but with the airvalved secondaries I reconned they still should work OK.

Posted By: Cab_Burge

Re: 392 hemi 2x4 manifold - 01/13/14 09:22 AM

Work on one circuit of the carb. at a time

I would use the metering rods upper step to control the part throttle mixtures, get it right and then work on using the rear jets to get the wide open miture perfect

I would try using a pair of two inch spacer under the carbs to increase the plenum volume and help make the motor more responcieve(SP?) to the throttle

I'm not sure if the four hole spacer on the open two inch spacers would work better

Using the two throttles hook together on a one to one ratio works way better on those stock type single plane dual quad intakes than trying to use them progressively like the later model dual plane intakes like the 426 Street Hemi intakes. I use to have a Chrysler 1955 331 Hemi in a 1934 Ford truck that I put a stock cast iron dual quad intake like yours on it, it didn't work worth a hoot with the AFB carbs hooked up progressively

Same thing on my 1957 Chrysler 300C with the stock WCFB carbs., not worth a hoot hooked up stock

IHTHs

Posted By: B1arno

Re: 392 hemi 2x4 manifold - 01/18/14 09:33 PM

Quote:

Work on one circuit of the carb. at a time I would use the metering rods upper step to control the part throttle mixtures, get it right and then work on using the rear jets to get the wide open miture perfect I would try using a pair of two inch spacer under the carbs to increase the plenum volume and help make the motor more responcieve(SP?) to the throttle I'm not sure if the four hole spacer on the open two inch spacers would work better Using the two throttles hook together on a one to one ratio works way better on those stock type single plane dual quad intakes than trying to use them progressively like the later model dual plane intakes like the 426 Street Hemi intakes. I use to have a Chrysler 1955 331 Hemi in a 1934 Ford truck that I put a stock cast iron dual quad intake like yours on it, it didn't work worth a hoot with the AFB carbs hooked up progressively Same thing on my 1957 Chrysler 300C with the stock WCFB carbs., not worth a hoot hooked up stock IHTHs

Hey, Thanks for the tips! Right now I'm just trying to get it idling without my eyes watering. Then I will work on the other circuits. The two inch spacers I think, will work well in my situation. I'm not sure which way to go, the four hole or open plenum either. This is strictly a street car rarely see high RPM so which one will build more torque?

Posted By: BigBlockMopar

Re: 392 hemi 2x4 manifold - 01/18/14 11:21 PM

Four-holed spacers make more low/mid rpm torque by increasing the vacuumsignal to the carbs.

Posted By: B1arno

Re: 392 hemi 2x4 manifold - 01/20/14 01:12 AM

Quote:

Four-holed spacers make more low/mid rpm torque by increasing the vacuumsignal to the carbs.

Thanks Bigblock!

Posted By: Hemi_Joel

Re: 392 hemi 2x4 manifold - 01/23/14 05:43 PM

Since it is so rich at idle, have you tried softer step up springs?

Posted By: moparpollack

Re: 392 hemi 2x4 manifold - 01/24/14 05:23 AM

This is pretty cool!

http://www.yellowbullet.com/forum/showthread.php?t=450368

Posted By: 41hemitrk

Re: 392 hemi 2x4 manifold - 02/21/14 09:09 PM

I think you need more carbs! I like 6

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