Single vs Dual Plane, big difference?

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goldenmopar

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I know of the general differences between the two types of intake manifolds, and that people say single planes don't have the pull off the line or low end torque that a dual plane gives, but i'm curious if it's REALLY that big of difference. I have a 750 Holley dual feed with vacuum secondaries i'm getting ready to throw on my 318, just need an intake. It's a stock motor with Hedman long tubes on it and dual exhaust. Should i just get the dual plane even though the single planes look super badass? :twisted:
 
Yes!

But IMO, I do beileve you should go out and ether purchase or borrow a single plane intake and bolt it on after a month of a driving the dual intake that is super tuned. Then you'll understand why us old guys recomend what we do and how it applies to the combo stated/listed.

With the advent of the RPM intake (as well as Weiands excellent offerings) a single plane is hardly suggested any more for a street and street/strip car. UOP has run both intakes and the single plane slowed him down a little on his 11 second ride. Flyfish also runs a dual plane. On his stroker that runs ratherly well I might add. (OK, better then what I said, it's down right a nice and quick ride.)
70AAR (AKA Tony) also has a slew of low 11 second rides with a RPM.

While the single plane does look bad ***, it does lack the lower end torque that is used to not only get off the line but the mid range can be down a few pounds of to torque as well. Only a superior single plane intake can out HP a RPM. And if your not using that rpm range a lot, as in living in it for the race, then the intake is a looser.

Try both intakes and see as well as feel for yourself. Enjoy the experience and experiment!
This is how I cut my teeth on gaining knowledge 30 years ago. Trail and error. It lead to A LOT of parts on the shelf. LMAO!
 
Oh! The only way I'd run a single plane now, like the M1 single plane is with a TQ in the street or a stupid bad *** high reving engine staying highly reved up on the track with a big Ol'Holley beathing in most deeply!

The TQ is a flexable enough carb to work OK on a M1 single for a decent throttle response and performance return to make it fun as well. Still better off with a dual plane though. I'll run one later on just for the fun of it. Why not?!?! LMAO!
 
I read that dual planes are better if you are not reving high. Back in my younger years when I had a different cam in my 67 GTS I had an Edelbrock Trantula single plane on it. After the restoration and a pretty close to stock cam I kept it on. Never had a throttle response problem with it running with the stock Carter. Of coarse if you take the carb off and look through the top of the manafold where the carb sits you can see the valves. It's a pretty straight shot. Always thought that was cool.
 
In a word....YES! i just swapped out my stock 4BBL single plane intake for a edelbrock LD4B intake & it picked up low end grunt it never had! Plus i use a wide band 02 meter to tune the carb. After installing the LD4B my air fuel raito cleaned up 12.6 beforehand to 14.4 at cruising light throttle! that's doing nothing to the carb just bolting it on the eddy intake & go! Pulls a lot harder @ lower rpm. It will surprise people when i tell em its a .030 over 273! Dual plane it the way to go man!
 
Dual plane. Single planes only 'get with the business' above 2500 and higher." Looking badass'" won't win any races.
 
X100. Not going to beat a dual plane,on the street.When you get deeper gears, more converter ,more head work /cam /compression(over 6000-6500 peak power) the single plane starts working good around here.
 
It is VERY combo dependent. I have run both the RPM Air-gap dual plane, and the Victor single plane on my 410. The Victor is quicker on my combo, but it took quite a bit of tuning to get it that way. I have been 10.89 @ 122 with the Air-gap, and 10.79 @ 123 with the Victor (doing an apples to apples comparison, both on pump gas). I now run on e85, and with the Victor have been 10.54 @ 125.

The Air-gap is the best all-around intake I know of for the small block Mopars....In my opinion.
 
I know of the general differences between the two types of intake manifolds, and that people say single planes don't have the pull off the line or low end torque that a dual plane gives, but i'm curious if it's REALLY that big of difference. I have a 750 Holley dual feed with vacuum secondaries i'm getting ready to throw on my 318, just need an intake. It's a stock motor with Hedman long tubes on it and dual exhaust. Should i just get the dual plane even though the single planes look super badass? :twisted:

Firstoff that 750 carb is too much for that little 318 same goes for putting a single plane on it..too much intake, you'd be much better off finding a dual-plane and a nice 600 carb..
 
See! I told ya Flyfish was in the know!
And here's another guy that knows a bit.
Stroked340 makes an excellent suggestion.
 
I just reread the original post...with a stock 318 you would be better off with a small dual plane like the Edelbrock Performer (or something like that) that lines up well with the smaller ports of the 318 heads. The Air-gap would probably not run the best due to the ports being too big....like I said, the right intake is VERY combo dependent....what works well on one motor, might not work well on another, it depends on the combo.
 
I just reread the original post...with a stock 318 you would be better off with a small dual plane like the Edelbrock Performer (or something like that) that lines up well with the smaller ports of the 318 heads. The Air-gap would probably not run the best due to the ports being too big....like I said, the right intake is VERY combo dependent....what works well on one motor, might not work well on another, it depends on the combo.

dual plane for little engines, unless you have 650 or more ft lbs of torque. w/ a lot of torque you don`t need to worry about low end grunt.
 
Firstoff that 750 carb is too much for that little 318 same goes for putting a single plane on it..too much intake, you'd be much better off finding a dual-plane and a nice 600 carb..

This is the way to go!!! ^^^^^^^^^^^^^^^^^^
 
I have had everything from a 318 to a 410. Without a high stall and gears, i would not consider a single plane. My 410 picked up 1.3 seconds with 2500 stall and 3.23 gears after switching to a dual plane.
 

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In a word....YES! i just swapped out my stock 4BBL single plane intake for a edelbrock LD4B intake & it picked up low end grunt it never had! Plus i use a wide band 02 meter to tune the carb. After installing the LD4B my air fuel raito cleaned up 12.6 beforehand to 14.4 at cruising light throttle! that's doing nothing to the carb just bolting it on the eddy intake & go! Pulls a lot harder @ lower rpm. It will surprise people when i tell em its a .030 over 273! Dual plane it the way to go man!


Yep, we took an Edelbrock Performer off and put an LD4B on a 318 and it ran great! Those LD4B's are awesome manifolds for the small block... :prayer:
 
It's a stock motor with Hedman long tubes on it and dual exhaust. Should i just get the dual plane even though the single planes look super badass? :twisted:

Given YOUR combo, I'd recommend a performer RPM intake. If you want to play around try a milled spacer like the HVH super sucker. Twice I've seen dyno numbers show it makes more power when on a RPM intake.

In regards to the carb, I think you are going to be disappointed. But TRY IT first considering you have it on hand already.
 
If you heads are stock small port go with the performer or even better yer an old LD4B intake & 600 cfm carb. You will be very happy with the out come from that combo. I know weiand makes a dual plane i think that has the smaller ports but don't know the part number or name of it. Another fall back option is the stock iron 340 intake. down fall is the port mismatch kinda hurts flow & port velocity .
 
Another fall back option is the stock iron 340 intake. down fall is the port mismatch kinda hurts flow & port velocity .

Another downfall is that it weighs the same as a baby elephant.
 
Another vote for SMALL PORT dual-plane and a 600. The 750 is really gonna e too much carb; secondaries will never fully open. My vote would be Eddy Performer carb (AFB)...the 600 cfm version.
Will make plenty of grunt down low and still give you good R's up to about 5500.
 
Well thanks for all thr replies and suggestions guys, appreciate it! I've decided to go with the Performer intake, and as for the carb i'll run the 750 since i have it and if it doesn't work out i'll get myself a 600.
 
Another vote for SMALL PORT dual-plane and a 600. The 750 is really gonna e too much carb; secondaries will never fully open. My vote would be Eddy Performer carb (AFB)...the 600 cfm version.
Will make plenty of grunt down low and still give you good R's up to about 5500.


Considering carburetor technology has improved over the past say 20 years. With the right carb you can go bigger without the adverse side effects. You don't have one of those carburetors.

now on to your engine. I would say 600 is the minimum, with the right carb you could go to 750cfm. Many people would be happier with a smaller carb. On the flip side, I found myself happier with a larger carb as did my engine.

One thing after running MANY different carbs over the years is that the Holley based carbs in my opinion are the best to work with. I would never run another Edelbrock carb. Add to that list the Demon. They've been hit and miss. Another thing I'd stay away from is vacuum secondary carbs. Run a mechanical secondary carb, tuned properly they are the best.
 
Know you're not talking about EFI here but if you were a single plane is what is used, at least with a port injection system. Once the intake is "dry" it has zero effect on where the power is made...within reason of course.
 
I seriously doubt that 750 is going to work well on that 318. I have a stock-ish 318 in my Challenger, it was even happier with a 600 than it was with a 650, both Carter's. It does have an interesting intake on it though, I've got an old Edelbrock StreetMaster on it. Single plane, but small ports. I'm sure it would probably do better with an air-gap or probably even a performer, especially with some port matching.
 
Know you're not talking about EFI here but if you were a single plane is what is used, at least with a port injection system. Once the intake is "dry" it has zero effect on where the power is made...within reason of course.

Not to mention it would have a 1,000cfm throttle body sitting on top of it.
 
Well thanks for all thr replies and suggestions guys, appreciate it! I've decided to go with the Performer intake, and as for the carb i'll run the 750 since i have it and if it doesn't work out i'll get myself a 600.

Can't go wrong here, the 600 (or even a Thermoquad,later on..) ,works great with a baseline Performer.
 
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