[Speargun]

I'm just about done with the 400 to replace the destructo 469 and need to choose an intake. I have an idea on what I think it will like, but I want to see what you would run.

Here's the combo:
400 +.030
Lunati Voodoo 702 cam
9.76:1 SCR 8.26:1 DCR
16 heads
Icon forged dish pistons
Scat forged H-beam rods
Factory crank
Fitech EFI

Going into a '67 Firebird with 3.54 gears and will see around 7000 miles per year. Use will be grocery getter, weekend cruiser, and maybe a trip to the track once or twice a year.

============================
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,300-5,500
Duration at 050 inch Lift: 219 int./227 exh.
Advertised Duration: 262 int./268 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.468 int./0.489 exh.
Lobe Separation (degrees): 112

[shaker455]

Stock intake would be fine.
Maybe jump over the performer and "try" an RPM.
Would be nice if you cut you water crossover free so you can change plenums at will.

[77 TRASHCAN]

72 stock iron, nothing else needs to be considered!!!

68-72....

[Skip Fix]

I'll agree a stock intake maybe an HO or a repop HO IF you get one without bad core shift-even them weld and port matching. They are a good 20 lbs lighter!

But since using the Fitech not sure how their spreadbore options are.

[firebirdcrazy1959]

Stock..Ran a Performer and a Torker 1 ..Stock is the way to go..

[TransAm 474]

I agree with others, Stock 68-72 Iron would work great. If you are wanting to use aluminum, definitely jump over the "Performer", and use the "Performer RPM". If this is a street application, I wouldnt even consider the single plane manifolds.

[Formulajones]

On such a mild build like that I'd run a stock intake. If you want aluminum I'd grab a repop HO/RAIV intake.

I've been daily driving and racing one of those for a couple years now on a 400 and can't discern any difference in performance at all between the two.

[Steve C.]

And I'll suggest on this specific combo you wouldn't discern much difference on the street with a STOCK iron intake and a Edelbrock Performer intake. Providing both have ports that match OK to the heads in use. The Performer intake will be lighter.

Onward thru the fog.


.

[Mike Davis]

Holley Street Dominator or my favorite Warrior.

[Steve C.]

How much more HP does it take to push that extra 25-30 lbs of cast iron intake.

From the 'fact or fiction file'.......

"Even the lowly Edelbrock Performer consistently provides more low-end torque with stock D-port heads than any of the factory 4-bbl manifolds"

Pete McCarthy
Pontiac Enthusiast Magazine article, 1997

And here he was talking about a 400 not a 455 !

Even Cliff Ruggles stated that over the years he had a lot of smaller CID Pontiac engines that he was involved with that used Performer intakes, and they seem fine and none of them had any stumble, hesitation, ping or any other problems like he found with his KRE headed 455.

Lets keep it apples-to-apples ! !


.

["QUICK-SILVER"]

Originally Posted by Steve C.

And I'll suggest on this specific combo you wouldn't discern much difference on the street with a STOCK iron intake and a Edelbrock Performer intake. Providing both have ports that match Ok to the heads in use. The Performer intake will be lighter.

Onward thru the fog.


.

Good read here that backs up what you're saying.

https://www.dapa.org/building-a-stro...ests/#more-106

Clay

[David Jones]

I wonder if the FI Tech would prefer one over the other.

[Speargun]

Originally Posted by David Jones

I wonder if the FI Tech would prefer one over the other.

Some say it has issues on a dual plane intake. Others say that a notch cut in the divider helps. Other say only a single plane will work...
I've always ran a single plane intake with my Fitech so I don't have any first hand experience with any dual plane issues.

[67gtospud]

Originally Posted by Speargun

Some say it has issues on a dual plane intake. Others say that a notch cut in the divider helps. Other say only a single plane will work...
I've always ran a single plane intake with my Fitech so I don't have any first hand experience with any dual plane issues.

I ran my FiTech on a factory dual plane intake with zero issues.

My vote is a factory intake OR a performer RPM if hood clearance is an issue. You won’t need a square bore to spread bore adapter with the performer rpm

[Gary H]

Factory intake with a spread bore pattern Fitech, or if square bore Fitech use a Holley Street Dominator or Torker II

[TransAm 474]

Originally Posted by David Jones

I wonder if the FI Tech would prefer one over the other.

The Fitech systems have been used successfully in both Dual Plane and Single Plane applications, but since the Fitech is a TBI system, and not a true "Port EFI" system, that injects fuel right into the valve, I still prefer the Dual Plane for a street application. We own two of the Fitech systems so far, both are used with superchargers. One is in a 1986 Trans Am, and is the 1200 PA Fitech system used as a "blowthrough" on a 383 sbc with AFR 195 heads and a D1SC Procharger pumping 14 psi boost. We use the Performer RPM Air-Gap intake on this application and works really well. The other is in a 1985 Chevrolet Long Bed C10 2wd pickup, and is the the 600 PA Fitech system used as a "drawthrough" on another 383 sbc with Brodix IK180 heads and a Magnuson M122 roots supercharger pumping 7 psi boost. For a "Port EFI" application, where the only thing that is being pulled through the manifold is the Air(not both Air/Fuel), I would no doubt prefer a Single Plane on all applications. Hopefully sometime in the near future, I will be converting the 750 Quick Fuel carb currently on my naturally aspirated 461 Pontiac, over to the 1200 Fitech, along with the addition of an 80mm billet BorgWarner S480 turbo.

[Half-Inch Stud]

Stock Iron intake
P4B
Performer RPM

We could agonize over which of these 3 Dual-Planes is better. I suggest "no difference" until there is a quantified evauation desired. Use whichever you have like.

[hobbygto65]

Do I get to vote twice, I have 2 RPM 's?

[grandam1979]

Performer or stock

[Scott65]

If you have a stocker, or a Performer, give it a try. My only experience with efi, throttle body mounted or mpfi is on single planes. It works well like that, but I'd think a single plane wouldn't be the best choice for what you're doing, unless maybe it was mpfi. FWIW, there's what looks like a nice Holley street dominator knock off with injector bosses cast in, polished, in the classifieds right now, priced right.
Edited to add: Not mine, no affiliation at all.