single vs dual plane intake

[Lloyd GT40]

Bob

Looking at 351w engines for an ERA gt40, I'm on the list. Is there a height consideration with intakes. My understanding is the single plane intake develops more HP but is 1.5 inches taller than the lower HP producing dual plane intake. Will the added height cause problems.

LLoyd

[DAVID GAGNARD]

Lloyd;

Not all neccessarily true,single plane intakes may produce more hp on a given engine,but are primarly designed for higher rpm ranges,dual plane intakes are designed to produce torque and hp in lower rpms ranges than a single plane intake....Check in a catalog such as Summit and they will give the recommended rpm ranges for specific intakes. They sometimes also give the heights of the intakes....there is a single plane intake made specific for low or little hood clearance...a buddy had to put one on his 377 stroker in a 90 model Mustang,can not remember the part number,but it is about an inch or so lower than most other single plane intakes....

As a general rule of thumb, the dual plane intake is a little lower than a single plane intake.....If you plan to do mostly street driving,you may want to consider a dual plane intake over the single plane type....depends on your engine and use for the car....

hope this helps,if not the Summit tech line will usually provide such info for you and should have intake heights if you give them a call....

David

[Great Asp]

If the car is light, say under 3,000 lbs, the single plane does not make that big of a differance in driving on the street.

But the dual is better on a say 3,300 lb car. I have had both on a 2500 lb SPF, and can not tell the differance in the low end, but top end (rpms)is a big differance. The vehicle weight has a lot to do with the response of the intake at low rpms, when driving on the street.

But then again, this ain't your Grammas Cavalier! Who cares? Either intake in a GT-40 will make you happy, and your neighbors jealous. I have the Vic Jr now, and love it. If you have room, I would recommend a single plane on a small block.

Eric

[aumoore]

I am running a performer rpm on my explorer motor with GT-40p heads. It pulls great from almost Idle up to 6k where the cam has already started to loose steam. The Performer RPM (and RPM air gap) and Weyand Stealth are good to 6500 rpm and they will produce a little more torque down below 4000 rpm where most street driving is done.

IMHO unless you are building a 7000rpm screamer go with a good dual plane.

[bmalone]

Agree w/ Eric. In a 2500 lb. car, you won't sacrifice streetability by running the single-plane. And it is also true that not every SP produces more power than a DP. It matters what other components are mixed, matched to equal the total picture.

I was told I had to run a dual-plane in my Tunnelport because of streetability issues. I have the single-plane, and would not trade it for anything.

You should really look at where you want your power to be and then see what the dyno says.

In general, DPs are maybe an inch, inch and one-half lower than SPs.

My $.02

[Tom Wells]

Spend a few bucks and get the PAW catalog. It gives all the manifold height dimensions.

Tom

[Bob Putnam]

There shouldn't be a height problem with the tall manifold, although there may be some loss of rear vision..

See this web page

[rlearp]

Lloyd,

If you haven't already come visit us over at:

www.gt40s.com

GT40s.com

you may already be on though. Bob P will certainly know if it will fit or not, but for most of the GT40 replicas one of the Victor Jr.s won't go, carb too high.

There is a recent Muscle Mustangs and Fast Fords which compares all the intakes on a stout motor, the single makes a little more top end but gave up a lot down low. But, in a light car you'd probably never notice it except at the track.

Ron

[Lloyd GT40]

Ron
I'm there already great site.


Bob

Thanks for the reply. My main concern now is not having a carb. poking out threw the rear window. What carb intakes are other 351w people using? As pointed out by several people it's a lot of HP in small car. The particuliar engine i'm considering is a 351 stroked to 392 with 430 hp. FMS. the intake that comes with the engine is the single plane. I just was wondering if it is worth replacing before installing?

Thanks guys

LLoyd

[Mr.Fixit]

The victor jr. intake is great, but if height is an issue, try the edelbrock torker 2. Low rise single plane. I have had good luck with these.

[Back in Black]

Is what we are using on my 514 EFI installation.
Will know very soon what this feels like, first hand . Pics in my gallery of a high polished T2, on my 514.

[CobraEd]

"lovers of their own selves, covetous, boasters, proud"

Do we know anyone like this???

[Back in Black]

[bonyhadi]

Ed
---
Only Bigot in Black!

[Great Asp]

Bony,

You need to put little smiles next to a post like that, so we all KNOW you are kiddin BIB.

Eric

[CobraEd]