dual quad vs single quad

[hdwrench]

i love the multi carb manifolds they ad a cool factor to the mopar engine look ! my question is is there a performance gain ? in my case i have a 69 hp bee 383 , currently with a single cast iron oem manifold. i have access to a dual quad ( i think it’s cast iron oem , but not 100% sure ) , would there be a performance gain with 2 carbs or no real advantage? i know it would look awesome but wanna avoid stepping on ……p.s. engine is mostly stock , 727 trans …

 

[gkent]

The engine will like never use the full capability of the dual quad so from a performance standpoint - probably nothing you'll notice. And especially for the associated cost! There are much better performance gains to be had for the same investment.

 

[Dave6T4]

I had a 1962 Chrysler 300H inline 2 X 4 setup on a 426 Street Wedge in a 1964 Polara 500 I used to own. These were original carbs, meant for a dual carb setup: no choke on front (secondary) carb, and choke on rear (primary) carb. These carbs also each had a velocity valve under the secondary venturies to help with transition to WOT. With some jetting experimentation, I got them to run pretty good. However, I never thought they felt as crisp as the single 750 cfm Edelbrock on the 440 in my 1967 R/T. "906" heads on the 440, "452" heads on the 426, and same Mopar Performance "Magnum" cam in both. On the street, I say the large single 4 barrel was the winner, but at the car show, the 2 X 4 setup was clearly the favourite. It always drew a crowd. Maybe on top end, the 2 4's might have an edge, but who drives that way anymore?

 

[hdwrench]

I had a 1962 Chrysler 300H inline 2 X 4 setup on a 426 Street Wedge in a 1964 Polara 500 I used to own. These were original carbs, meant for a dual carb setup: no choke on front (secondary) carb, and choke on rear (primary) carb. These carbs also each had a velocity valve under the secondary venturies to help with transition to WOT. With some jetting experimentation, I got them to run pretty good. However, I never thought they felt as crisp as the single 750 cfm Edelbrock on the 440 in my 1967 R/T. "906" heads on the 440, "452" heads on the 426, and same Mopar Performance "Magnum" cam in both. On the street, I say the large single 4 barrel was the winner, but at the car show, the 2 X 4 setup was clearly the favourite. It always drew a crowd. Maybe on top end, the 2 4's might have an edge, but who drives that way anymore?

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ya that certainly looks awesome, real crowd pleaser !!! i was thinking of a 750 on the single cast iron manifold, too much for the 383 ?

 

[MWbirdLOVER70]

ya that certainly looks awesome, real crowd pleaser !!! i was thinking of a 750 on the single cast iron manifold, too much for the 383 ?

That’s what I run but 3310 vac secondaries on automatic and aluminum intake

 

[6PKRTSE]

I love multi-carbs on anything also. I have a 340 Sixpack, 383 Sixpack, 440 Sixpack, 383 dual quad, inline dual quad street Hemi, magnesium cross ram Hemi, and dual 1050 Dominators on another Hemi and 2 more 1150 Dominators on a KB alum mock up Hemi. I don't have pictures of everything though. All street/strip driven.

 

[GTX JOHN]

3310 Holley works well on a 383 as it is a versatile
carb for many different applications.

I have also in the 60/70s seen a nice improvement with
a 440 AVS which has 11/16 primaries. These bolt
on your stock (301) intake and together work nearly
as well as aftermarket manifolds and Holleys on a
fairly mild 383 combo in our testing when properly adjusted.

It was faster on the track than the production 383 Cast manifold
and factory 1962 (58/59#) carbs on a otherwise stock 383.

 

[Dave6T4]

Putting a 440 AVS on a 383 was a little trick we did back in the day. Noticeable improvement. That air valve over the secondaries made it pretty hard to overcarb.

 

[gkent]

Instead of the dual four barrels, why not invest in a '69 oval air cleaner? Those things have just as much of a visual impact as a pair of air cleaners. And its a worthwhile investment (have you watched the price of those over the years ?!?!?)

 

[lewtot184]

i wouldn't put one of those old factory iron dual quad intakes or an offenhauser 360 intake on that 383. the single plane intake will kill too much torque on an engine that struggles to make torque. i did run a dp6b intake back in the day on a 383 and liked it but it's a dual plane intake, works well with corvette carbs, but the cost nowadays is stifling. i like multi carb but all the parts have to fit the build to be successful.

 

[69Bee]

...have a 69 hp bee 383 , currently with a single cast iron oem manifold. i have access to a dual quad ( i think it’s cast iron oem , but not 100% sure )...

An OEM Dual Quad manifold ever existed for the 383. The only engines that had a Dual Quad manifold were:
1) '55-'59 Various 301, 318, 350, 331, 354, 383 RB, and of course Chrysler 300 Letter Series 392 Hemi engines
2) '59 inline DQ & '60-'64 Chrysler 300 Letter series, '62-'64 Max Wedge engines
3) '64-'70's 426 Hemi

I am unaware of any 'Legit' OEM multi-carb setups after the Hemi with the obvious exception of the 6-Pak 340/440 engines and these can be either cast iron or aluminum depending on year. SuperBee 383's engines ONLY came in a single 4BBL version. The aftermarket: Edelbrock, Offenhauser, Wiand, and even Direct Connection/Mopar Performance might have made a Dual Quad "B" manifold, but the only aftermarket offering I know of is Edelbrock for the "RB" engine.

 

[GTX JOHN]

I raced a 1962 383 Stock Eliminator Dodge that had an OEM Mopar cast iron
intake with Mopar number on it. NHRA must of thought they made them as
I have several friends that still race them in Class in stock today.

 

[Dave6T4]

Agree. 343 h.p. 383. They ran the same Carter AFB's I had; -58 and -59. I have had a couple of those cast iron Mopar inline intakes over the years.

 

[AR67GTX]

Max performance for a 383 - modern intake and single 4bbl. Max cool at cruise night - dual quads.

 

[RJRENTON]

i love the multi carb manifolds they ad a cool factor to the mopar engine look ! my question is is there a performance gain ? in my case i have a 69 hp bee 383 , currently with a single cast iron oem manifold. i have access to a dual quad ( i think it’s cast iron oem , but not 100% sure ) , would there be a performance gain with 2 carbs or no real advantage? i know it would look awesome but wanna avoid stepping on ……p.s. engine is mostly stock , 727 trans …

How about eight (8) Stromberg 94s or eight (8) Holley 97s (they're both 2 bbl carbs) on a home-made log type manifold .......with little scoop air filters.....more pipes than a church organ......just a thought.....
BOB RENTON

 

[matthon]

Tunnel ram on a warmed over 383 with aluminium heads beats an 850 Holley on a Performer RPM intake.
Ran this 383 with the single 850, tunnel ram with 390s, 600s, then efi.

Tunnel ram with 600s on a stock rebuilt 383 hp engine, 850 a bit better.

I wouldn't bother with a low and slow dual quad on a 383.
The only dual intake manifold for a 383 is the Weiand tunnel ram, imo.

 

[khryslerkid]

How about eight (8) Stromberg 94s or eight (8) Holley 97s (they're both 2 bbl carbs) on a home-made log type manifold .......with little scoop air filters.....more pipes than a church organ......just a thought.....
BOB RENTON

I like my dual 600s

I haven't felt any "lack of power" lately. 440s are torque monsters!

 

[hdwrench]

Instead of the dual four barrels, why not invest in a '69 oval air cleaner? Those things have just as much of a visual impact as a pair of air cleaners. And its a worthwhile investment (have you watched the price of those over the years ?!?!?)

i do have to choose an air cleanyset up so i’m searching now for a set up . the oval would be awesome…

 

[RJRENTON]

View attachment 1637447

I like my dual 600s
View attachment 1637449

I haven't felt any "lack of power" lately. 440s are torque monsters!
View attachment 1637450

3rd pix......instead of measuring MPG, it looks like the correct measurement is Miles Per Tire......or burning $20.00 bills makes more smoke.....which in this example, is quite hazardous.......just an opinion......
BOB RENTON

 

[khryslerkid]

3rd pix......instead of measuring MPG, it looks like the correct measurement is Miles Per Tire......or burning $20.00 bills makes more smoke.....which in this example, is quite hazardous.......just an opinion......
BOB RENTON

Sounds like something my father would say back in the day