Thread: Dual Quads vs Single 4 BBL...

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.........I'm running a 496", full roller BBC, stroker, in a chopped and twice "Z'ed" '40 Chevy sedan. I love the look of dual quads. Right now I'm running an 800 cfm Edelbrock carb and I don't want to change to something that would decrease my horsepower. I read a few months back an article where a comparison was done between the Edelbrock Airgap single 4 bbl and the dual quad version. The single 4 bbl actually cranked out more horsepower and torque. Go figure.
Anyway, in order not to lose horsepower I've thought about going with a street tunnel ram setup. I know little about tunnel ram, but I do know you might lose some low end torque over a single 4 bbl. Maybe this wouldn't be too noticeable with a BBC vs SBC? Like I said, I really like the looks of dual quads, but not at the expense of horsepower or less low end torque. What are your thoughts on this? Thanks.


Tom

I don't know much about dyno's and such as that, Tech or maybe some of the others more versed may speak up. I have been running dual quads on SBC's and BBC's for quite a few years. Not once have a seen a seat of the pants drop in horsepower going with two 4's, and I from my own experiance "think" that I do feel an increase in power. I do run Edelbrock Carbs 600's on the BBC and 500's on the SBC. These carbs are vacuum secondary carbs and draw what the need, in the two sets I am running now the seem to perform very well.

I am not a fan however of tunnel rams on the street. The are meant to perform at higher RPM's and I just never had any luck with there streetablity.

Roland

well i ran tunnel rams on the street and only took it off for a blower i have a customer with a tub out 57 chevy pickup that drives it every were with a tunnel ram bbc .with smaller cfm carbs they work at wot you will make more power .i never lost any TQ that i seen or needed. the real ..dyno show more power with a old weiand tunnel ram on my old 572 vs the re work super vic but the single plane pro-filer may do a bit better .has a lot to do with your power band and intake port runner and plenum .. but added carb for some may be added work so if you want the look. it can work my old ram setup has been on over 4 engines not one guy said it did not work

I agree with you Pat on them old Weiand intakes I had one on a
Boss 302 that was port matched, with a 780 holley.
That thing could realy move.
Kurt

I run duel 600 holley vac seconds on a weind tunnel on the street, and it works great. Just cant get by a gas station. The tunnel lags a little on the bottom, but not enough to care about, I tried a rpm performer, with a worked over 780, and it did have a snapier bottom end, and ran well, but didn't hold you in seat like the tunnel does. and at the local car cruises, the tunnel gets more respect. I say run the duels, just for the cool factor. if you like it, you'll make it work. keep smiling T.

Heck, I know they lose a lot of bottome end. I know they're more hassle then they're worth on the street, I've seen a well tuned single four beat em up on the dyno, and I'm still looking for a pair of 390's to put on a Windsor stroker!!!!! The eyeball appeal and the kewl factor has got to be worth something. Besides, I run a 5 speed and can twist the snot out of it and make it work on the street, too!!!!

Yea buddy 2x4 is the only way I like to go

Originally Posted by Dave Severson

Heck, I know they lose a lot of bottome end. I know they're more hassle then they're worth on the street, I've seen a well tuned single four beat em up on the dyno, and I'm still looking for a pair of 390's to put on a Windsor stroker!!!!! The eyeball appeal and the kewl factor has got to be worth something. Besides, I run a 5 speed and can twist the snot out of it and make it work on the street, too!!!!

well not not much low end to loose . when you have a big sumof a$ ich .as of the dyno well let s say the 572 like s two 4500 holleys and yes smaller engine you have to twist the snots out of it ...but he as a 496

thats a very restricted intake scoop

something has changed !!! i cant post a picture

yea can't beat the dual quad wow factor

three duces beat a pair anytime, cept for a blower!

Originally Posted by DONNIE G

three duces beat a pair anytime, cept for a blower!

I like 3 deuces...on a small block. Don't look right on a BBC. JMHO.


Tom

i've run 2x4s on the street for a long time.i recomend carter/edelbrock cars over holleys for the street.on my 428 ford i run the carbs backwards they just seem to work better that way.but on the buick(425 super wildcat nailhead installed in a 56 chevy w/4-speed)i ran them the way they came from the factory.facing toward the front of the car.on the street the carters are better and also you set them once and forget them.to show you how long its been when the edelbrocks came out i had retire from the auto business have never touched one.but i have heard both good and bad about them,one day i'll buy one but i have a stack of afbs in the shead.

Tom,

Just man up and get a polished 871 will you!

You get the wow factory and another couple of hundred foot lbs of torque. Its what the TV people call a win-win situation.

Come on, you know you want to