Mark A Shields

My brother was saying that on, I'm guessing a dual plane intake, I believe that's what I just got, there's a picture below. That if you cut about 1/4" down on that divider plate in the middle and remove that 1/4" section, that I would gain some low end torque. Anyone ever heard of this??

GRENDLE

yeah, you can do that. there are a few mfr's that do that on their intakes stock. i also know a builder that takes the wall almost all the way out too. it's supposed to let the pressure/vaccume equalize on both sides of the manifold and help equalize the flow or some crap. i did it a few times and didnt notice much.

Pukka

I would think that removing that divider plate would turn your dual plane into a single one. If I'm right then single plane intakes don't promote off idle torque as well as duals do.

E-Z Rollin

Adds some top end power at the exspense of low end power,if you have a mild 350 don't waste your time.

jcb999

if hood clearance allows. If the loss of lowend comes with an appropriate increase of hi-rpm power, then its a good trade-off. The standard performer type intake will not make much hp above 5500 regardless.
If your GM motor still has the stock cam, I would not worry about it.

Damon

Yeah. Forget it. Not worth doing. If you think you want to try something like this then get a 1/2" open spacer and throw it on top first before you permanently grind away the plenum in the manifold.

black89ws6

agree to that...it's a lot easier to take that material out than it is to put it back

F-BIRD'88

Your brother has it wrong.
If you cut out the center divider all the benefits of a dual plane
will be lost. Like smooth cruising, low and midrange torque, and gas mileage and throttle response. If you want a single plane,
go buy one. Like a Victor Jr. If you need to increase the top end power of your dual plane, put on a larger carb. Try a fully divided spacer (Edelbrock, TD etc.) to increase plenum volume. Or get one that is tuned to a higher rpm EG(Performer RPM).

Mark A Shields

He didn't mean the whole thing, just a small section. But I'm just going to keep it the way it is.

8Mike9

It's supposed to aid in upper RPM HP, not lowend.

Take a look at the newer dual plane intakes, they have the cutout as you describe.