Trying to choose between these two manifolds. Currently have the RPM.
Almost all street driving, until I get a 2-axle trailer because the nearest strip is 90 miles away anyhow.

Combo: '72 Dart, 451, .652 gross lift (272@.050) cam, QFT 950. For now, running bowl-blended iron heads. Will shortly be putting on PRH-massaged Speedmaster aluminum heads good for 293.5 cfm, 10.6:1. A833, 3.91 rear (3000 rpm @ 60 mph), caltracs, dual 3" exhaust with x-pipe. And a 100-150 hp nitrous plate if I feel the need.

The RPM intake is known to be good for midrange torque but I wonder how much the Street Dominator gives up in the 2500-4000 rpm range compared to what it adds on top.
Thoughts?

I would also consider a Victor 383 but again, worried about compromising the already mediocre low-end torque further.
Crossposted to FABO.

RB or B engine? I have both manifolds for a RB 440, but I've only used the Street Dominator so far. I'm gonna try the opposite this summer, try out my Performer RPM.

In my humble opinion, the Street Dominator doesn't seem to give up too much @ the lower rpm range. But the Performer RPM is probably "better" for the street. You've got more compression, gear, and are lighter so I'd imagine you'd be missing even less than I do

Seems like a huge cam if your aim is to street drive it primarily.

I've dyno tested the RB RPM intake against a Mopar 4150 M1 single plane and against a Eddy Torker 2.
The RPM was way better than the Torker 2 every where and it was better than the M1 below 5500 RPM on torque and HP.
I tested all 3 the same day from 2500 RPM to 6500 RPM with the same carb. and no other changes.
I like them a lot and use them every chance I can on street and strip motors(RB and B motors) with all 440 size intake port heads

I feel the dual plane rpm is mismatched with the rest of your combination, but you might like the way it drives enough to not care.
If it was mine I'd start with the street dominator on this one, and would save the rpm for a milder combination.

I started out with an amateur ported Street Dominator on my own 451 which has rpm heads and slightly smaller cam than yours (262/266, prh custom) .
I threw it on the chassis dyno and started testing carb spacers. It kept picking up power with more spacer which was good, but once I got to 3" worth of carb spacers
my next thought was it was kind of ridiculous and I'd probably be better off with a different manifold.

Later I tried a victor which I cleaned up a little myself at home, and it proved to be a good decision as it picked up very slightly over the huge carb spacer/HSD combination,
then I went to a slightly larger carb and picked up a handful more.

There wasn't anything notable about the difference between how they drove on the street, but I have an automatic and high stall converter.
You might like the way the dual plane drives at low speeds more, and might not care about chasing hp which I'd understand.

Myself I'd be curious to know about about TFS VS Victor for that configuration, but then again I like to experiment just to see what happens.

Good luck

I'm into small blocks, but remembered these articles. May provide more info for discussion and comparisons to personal experiences.

Mopar 383 intake comparison Part 1

Mopar 383 intake comparison Part 2

Thanks, I've read both those articles more than once

This is another good one, that has an engine closer to mine (451 is a 400 block with 440 crank):
https://www.hotrod.com/articles/mopp-0207-intake-manifold-engine-and-rpm-range-test/

I actually do like the way it drives with that big cam - as long as I have the revs over 2000, there's plenty of power for cruising. And I can wind it up into the powerband (3000+), floor it and scare myself

I'm a big fan of the HSD and, like Zippy said, the more carb spacer you add the more it likes it! Mine had a 1" phenolic, then a 2" phenolic and now the 1" with a nitrous plate.

The great thing is it all fits under my stock, flat hood.

For an all around street and strip intake, it's hard to beat a HSD.

Oh yeah, Nitrous is best used with a single plane intake. So if you plan on hosing it...

Who has modified the HSD's thermoquad base to a 4150 square base. Did you weld it, then grind it?
I want to do that. Seeme like you could improve the transition to the runners at the same time and make it fit a spacer of choice, which would be
open, closed, tapered, etc ?

Am I OCD ?

I recommend asking your health professional on this

With that cam I’d vote for the 1-Victor 383, 2 - Holley SD, 3 Eddy RPM

I'm a big fan of the Holley SD, but your combo seems like it'd prefer something a lil more racy for max power.

I did a back to back, same day, drag test w/ my cuda years ago...11.4 sec stock stroke ported iron head 440 combo at 3700 lbs.
I tested the Performer RPM against the Holley SD. Both ran best w/ a 1" open spacer and produced nearly identical timeslips.

Most of my time is spent on the street, so torque will be more important to me than max horsepower... not sure the Victor would be the best choice there
I do have a 1" open spacer already (1/2" nitrous plate, 1/2" wood).
Sounds like I should keep the RPM for now, but if an SD comes my way, it could be an interesting comparison.

I haven't weighed the Dart yet, but I'm waay too close to 300# myself. And I'm sure it will be faster than 11.50 with the good heads, hopefully on motor alone, which means I will have to put in a 6-pt roll bar (another 100#).

Time to start the diet. After the holidays, anyway

Those low deck intakes are both fantastic. They were designed for 383/400 CI. But work great on the low deck strokers. My opinion the Street Dominator will make a little more up top while not having compromises down low. Just how it was designed. The small plenum single planes were awesome street manifolds on BB mopars.

Most of my thoughts have already been posted by others, but FWIW.
That is a lot of cam, especially for only 10.6 CR.
Where does the current combo like to be shifted at the track?
I would have the Speedmaster heads milled to up your CR, hopefully 11.0-11.5

For the cam and nitrous I give the nod for the Holley SD and as much spacer as you can fit (since the Edelbrock is taller already).
I think that new combo will go to 6500 rpm easy. But both intakes should be good.