dual quad low profile?

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Captainkirk

Captainkirk

Old School Mopar Warrior
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I've been window shopping for a better induction setup than the 650 Holley double-pumper on a Torker 340 I've been using, and noticed something unusual; NOBODY makes a (hemi-style) low profile dual-quad setup for the SB Mopar! Weiand makes a tunnel-ram setup, and of course, you have the six-pack, but that's about it. You can find a setup for every other engine under the sun, including SB Chevys, Fords, Pontiac and AMC! Anybody have an idea why? It seems like a pair of 600 vacuum secondary Holleys or Carter AVS's you could actually close the hood on would be a great setup for this motor?
 
Offy used to make one for the small blocks and every now and then one or two show up at a swapmeet. Iv got an eddy tall tunnel ram sitting in the garage thats going in my 27 T.
Eddy just came out with a dual quad air gap intake for small block chev so maybe if they get enough demand for it they will make a mopar one too.
 
Open up a PAW catolog and order one from Offenhauser.
 
Bummer. The Offenhauser 2X4 low rise & hi rise both state emphatically that Holley carbs will not fit; even sideways; and the only carb combo I've even considered is a 2X4 Holley setup with vacuum secondaries. :cwm10:
Also, they're both set up for square-bore carbs, so Holley is about the only way to go. I dislike adapter plates with a passion. I'll have to do more thinking unless somebody else has a better idea.
 
Hey Kirk, twin (Small) AFB's or better yet, AVS's with tuneable air doors. I would not even consider Holleys.
 
I have a natural aversion to carbs that you have to take the top off of to tune. :thumblef:
The problem with the AVS (good carb!) is that it's a slight spreadbore......the manifold isn't. AFB's are manual secondaties, right? I can't see stuffing 1600 cfm down a 340 at lower rpms when I stand on it...like trying to drink two beers at the same time :drinkers:
Actually the six pack looks like the hot setup for this motor, but the cost............. :wack:
 
Your all screwed up on this AFB/AVS thing I believe. Lets take a look at this carb set up a second.

All square bore carbs are square bore because of the "In general nature of equal sized throttle bores. The slightly larger sized rears of the AFB/AVS do not make them slightly or totally spreadbore in any way at all. If anything, it aids in throttle response being better for the overall size of the carb. Also a reason for the T-Q and Rochester spreadbore carbs. Also the mid 70's and on emmisions levels.

Taking the top off a Carter should be at best a one time deal, twice if it's really off. The rods do the rest. Super tuning them may require multi takes at it. The rod has more control over whats going on than the jet does. Besides, it's only a few screws and a couple of clips. No big deal. You go through more for an intake. And thats easy stuff.

Small AFB's can be purchased new @ 500 cfm from Edelbrock, OE carbs can be as small as 400. Though hard to find sometimes.
 
Actually I was referring to the holes in the manifold.The Offy manifolds are equipped with four evenly-spaced, same diameter holes (square bore) and appear they wouldn't even fit a slight spread bore carb without the use of an adapter plate.
 
OOOOOOOOOOOO, pardon me.
In that case, old AVS and AFB carbs can have the base drilled out to fit if need be and new Edelbrock AFB/AVS carbs have both holes for both patterns.
Again, sorry.
But there is no Slight spreadbor carb. It's not the carbs mounting holes that declasre it spread or square.
 
I'm sure it could be made to work, I just dislike adapter plates....they smack of cheesiness. I've got the original AVS and TQ's that came with both motors, plus and extra TQ I traded a couple of AFB's for once in a fit of lunacy. Problem with my motor is, it's always had choke issues.......needs one to start, but won't run with it on...even a little. So I've solved the issue in the past by running a Holley w/manual choke. I like Holleys. Especially more than one. You, on the other hand, seem to be not-too-keen on them...any particular reason (other than being overpriced, and susceptible to novice-tinkering problems)? Most of them work fairly well out of the box, but every Rube Goldberg has to mess with them to get them tuned right, after choosing the entirely wrong (read; too big) carb for their setup! And then they compound the issue by throwing on a double pumper that virtually eliminates any chance of the carb compensating for the ineptitude of the builder....but I digress.....back to Carter. You seem to know a lot about them. Your opinion on the Edelbrock Performer? I believe this is a warmed-over AVS, if I'm not mistaken. What do you like about these carbs & why? I still have plenty of time to make the decision on carb & manifold, so I'll take all the input you can throw at me. This is the current setup;

Holley.jpg
 
i am runing a edelbrock thunderseries 800cfm AVS carb on my 340 and its a square bore design its just like any other carter afb or edelbrock carburator except for that the airdoor on the secondarys can be adjusted very easily and in my opinion these carbs are much easier to work on than the holley design, if i where to use a dualquad manifold i would go for edelbrock carbs just my 2cents ;)
BTW is there anyone that has a picture of any of these manifolds?
 
Hey Kirk. On the carb issue. I have run Holleys in the past. The only thing I did not like about the Holley other than what you wrote and made me laugh is they tip in and out of tune abit. Still, you should absoultley run with what you are comfy with. No doubt.
any particular reason (other than being overpriced, and susceptible to novice-tinkering problems)?
Click to expand...
LOL
The Carters allways came cheap. Easy to work on, run good. There not to keen on large cams though. Then again, worse come to worse, theres a Holley for the big cam syndrom.

I have had 1 and only 1 Edelbrock. It didn't work to well. I do not know why. It is a basic copy of the AFB. There Thunder series AVS is a hybred of a AFB bottom and a AVS top.
 
Ohh, on the current set up. If a intake change comes about, that would be it. The old Torker design has been superceded by the TorkerII and for the life of me, I can not think of a single reason a street guy would purchase it new. Theres the RPM and air gap versions that do better. (But we know that allready.)
Now, if you can get a old intake at a meet for cheap, theres not a single reason not to use it. I have an old TorkerII that will get used later. Old doesn't mean bad.

100_0466.jpg
 
Well, I definitely know the Holleys.....and done enough work on them. The first one I had was a 600 SP that leaked fuel like a lawn sprinkler on a golf course from the throttle shaft bushings. I'd go out and thrash my Duster on a good run and find little puddles on the intake......Yikes! :wack:
After I changed the teflon bushings it was better, but not perfect, as the base casting was worn from some twit running it with no bushings. (No, not me; the guy I bought it from used!) I put a secondary metering block on it and finally got the secondaries tuned, after going through four or five springs and about a dozen jets. Just about then a guy offered me the 650 double pumper and I had to start all over again (though, for me it was a much easier carb to tune). So, I figure I've paid my dues with the Holley Blues. But again I have no beef with the Carters except for the choke thing. Also with the 2X4 setup Holleys have to be mounted sideways unless you're using the shorty SP's with a secondary metering plate. The Offy manifold won't even take Holleys sideways. Oh well, as I said, I've got time to think on this one.
 
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