Already made that swap and went back to the RPM. Much better throttle response but a tenth slower at the track. I go to the track twice a year.....easy decision.

I had a SD on a 72 440. Worked well.

Put a RPM on it and it was much better. Little bigger carb than the Holley EFI I was running, 750 vs. 700. Had much better low end with the RPM.

Running a SD on a low deck currently. I like it but can't help but wonder if that is why I seem to be down from previous MPG's from other 383s I have had with the stock intake on them.

Street Dominator = 455hp, 449 ft lbs

Performer RPM = 451hp, 457 ft lbs

http://www.hotrod.com/techarticles/hrdp_0712_mopar_intake_manifold_comparo/index.html

....to me it doesn't look like enough difference to worry about at the 450hp level.

Dave

First hand experience on my 71 Bee / Street car
#s 383 Mag / Balanced / .030 Over Forged / Old school Mopar 284-484 cam / 18 initial - 38 total / 3:91 Gears / Blah Blah

The 383 Holley Street Dominator off idle or launching at say 2500 rpms is a dog - That intake does not come alive until at least 3500/4000 Rpms and anything above that it flat out performs

However

The Edelbrock Performer RPM / Even just the Edelbrock Performer is just a much better intake on a mildly built 383 Mag Street Car

Like others have stated - On the 383s the Street Dominator just doesnt have the low end torque and it really shows in that Hot Rod Article and from my experience testing all three intakes on the street launching / off idle etc.

Scott

See graph of the results below. Ron

I tried both years ago, and found very little difference between the two on my old reringed '73 440. 12.60s with the SD, and 12.50s with the RPM, MPH was exactly the same between the two...the only time it would break 106MPH is when it had wheelspin. If it hooked up, it went 106 every time no matter what I did.

RPM felt perkier at small throttle openings when driving it easy. SD was also fine, but not quite as responsive to a light touch on the throttle. I had a 4 grand converter at the time, which should cover up any differences, but it was still noticeable.

I think I liked the rpm a little better on that combo but the difference was small, can't really go wrong with either one.

The graph info waspulled fron the following the Moparts Link:

https://board.moparts.org/ubbthreads/show...e=1&fpart=1

From: Dave Freiburger Date: 8/27/07

We have a winner: "I'll put the overall average TQ and Hp on the 6bbl, then the RPM, then the Torker."

Here's what our test showed. Each test is an average of two dyno pulls to remove anomolies. The numbers shown represent average power from 2,500 to 6,000 rpm. However, even averages do not tell the entire story. For example, the Torker and the RPM have the same average numbers, but they are not the same: the power curves cross at 3,900 rpm, with the Torker making more high-end and the RPM making more low end.

As for peak power, the Torker, Street Dominator, M1, and Victor were all at 455-456 hp at 5,900 rpm.

Nearly every manifold made 450-460 lb-ft at 3,800-4,100 rpm. Most of the dual-planes were way stronger than most of the single planes at rpm points below peak torque. Duh.

I think the tunnel ram would have done a lot better as a dual quad. I was surprised how well the Six Pack did, but I think that's because of this engine's low-rpm and low displacement. Six Packs have killed big power in other tests with other more radical engines.

That just proves that you really have to consider the test before you can make a judgment call, and you can't just look at one point of data and say "that's best" overall. It will also be interesting to see how this may change when we put better heads on the engine. If the 906 heads are currently the restriction, then other weak points in the intakes will be revealed with better heads.

More data in the December issue of HRM.

2500-6000 AVG 3000 4000 6000
INTAKE LB-FT HP LB-FT HP LB-FT HP LB-FT HP
Six Pack 428 348 413 236 459 350 391 447
Torker 427 348 395 225 455 356 397 454
Perf RPM 425 346 408 233 457 348 392 448
Victor 383 425 346
M1 single 424 345
1x4 tr 425 346
TM6 424 345
DP4B 424 344 419 239 454 346 387 442
Performer 422 341 418 238 452 344 382 436
Action Plus 421 341
Street Dom 421 344 381 217 449 342 395 452
Team G 409 334
Offy 360 406 338
Offy 2x4 408 330
Offy DP 404 327


Here are just a few data points. Also, a reminder that this thing had STOCK heads. I think the heads were the restriction, therefore the manifolds did not make drastic changes; except for the really bad ones, the different intakes just wiggled the numbers around by 5-10 hp or shifted them to the low rpm (dual plane) or high rpm (single plane). I'm pretty certain there will be more difference between the intakes once some better heads are on the engine. I find that out at the end of the month.

RPM LB-FT HP
Street Dominator
3,000: 381, 217
4,000: 449, 342
6,000: 395, 452
RPM LB-FT HP
Torker
3,000: 395, 225
4,000: 455, 356
6,000: 397, 454

Perf RPM
3,000: 408, 233
4,000: 457, 348
6,000: 392, 448

DP4B
3,000: 419, 239
4,000: 454, 346
6,000: 387, 442

Performer
3,000: 418, 238
4,000: 452, 344
6,000: 382, 436

Six Pack
3,000: 413, 236
4,000: 459, 350
6,000: 391, 447

That's a great article, but I hadn't seen the graph results before: thanks!

It's sure nice to note that the 6 pack did so well, especially since it's the only stock manifold in the test. 450ish hp is a great comparison point as it's right where alot of enthusiasts are, power wise.

I'd note that there was a follow up to this test at a higher hp level for those interested.

Dave

At the 4K point it shows the Torker as having less torque but more horsepower than the sixpack or the rpm. Looking at the formula for HP
(Torque x RPM) / 5,252 = Horsepower
you can see that at any fixed rpm if the torque is higher the HP must be higher also. Oh well not the first time a magazine goofed.

As I had stated before we did a test on my sons low deck 400 in his Dart. Has stock bottom end with KB pistons and 10.6 comp. Its a mild 400 with the MP.557 solid cam and Eddy RPM heads. It has 3.91's as he drives the car all the time. He switched to the Street Dominator and ran 11.59 @ 117. Then he put the Performer RPM back on and ran 11.55 @ 116. Yes the RPM is better down low but not all that much. I wanted to try the RPM on my 63 but was afraid it might hit the hood so I went with the SD and I love it on my 63 as it has very good 60 ft's for a mid 11 car (best of 1.57) and I wonder if it would 60 better with the RPM. It definetly is no dog using the SD. But the good thing about the SD is that it is a very good intake and it sits very low so it will clear just about any cars hood when many intakes like the RPM wont. All in all both are good intakes. Ron

Dave,
I made the graph to compare the values on the same scale to visually see the advantages and short falls of the different intakes.
Thanks,
Ron

Ok so we have the numbers now.. Can I run my stock kickdown and throttle cable with a Performer RPM intake.I have a Weiand now and can't find the right setup.The car is a 71 Superbee 383 column auto.Any HELP would be appreciative.