open carb spacer onto a dual plane intake

If I take a 600cfm Edelbrock Performer carb, put it on an open 2" spacer, with multiple gaskets at the bottom to keep the heat from going into the carb, and put in on a dual plane Performer 289 intake, will the "open" of the spacer affect performance on the "dual plane" of the intake?

If so, will it be a positive or negative effect, and why?

 

You'll have to remove the sidepipes to use the spacer.

Okay just kidding. Basically, it will probably lose some low-end throttle response but gain in midrange and top-end flow...

 

OK,

The sidepipes come off tomorrow. Then I will replace them with those pipes the go up from behind the door, straight up into the sky like the 18-wheelers have.

They made a pickup in the late 70s that was red and had those 18-wheeler pipes on them. Anyone remember what that was called? Looked like a fire-truck?

TL

I owe you a beer, but I don't plan on going through Colorado any time soon. Can a send you a gift-certificate to Chili's or something?

 

Yep that was Dodge's Little Red Express with the wooden stepside

 

I am using the same carb and manifold. I threw on a MR gasket spacer last year and my car seemed to idle really crappy so I took it off

I dont know if I just had bad luck? It sure did make a difference in heat exchange though. I wonder if they make a dual plane spacer? If they do I'll buy one of those for sure.

 

If it's just heat-shielding you're after, you can simply use a 1/2" phenolic spacer (I thiink they make a 1/2". I've seen some that are pretty thin)...

(edited for typos)

 

They make 'four hole' spacers in just about every size they make open spacers. Even 2".

I used a 2" open on a Perf. RPM as a band aid to wake up what was an extremely lazy intake IMO. It does work, but not nearly as well as just using a mild single plane intake that is designed for what you are doing.
Putting an open 2" on a Performer will gain you some power throughout the power band, but you will have to tune your carb especially for it or you will lose throttle response. How to do that with an Edelbog? I have no idea. No matter what you do to get it the best it will ever be, you are still way behind a Holley.
Dave

 

Well, it is only $20, so I will give it a try. My car runs exceptionally well right now, and if the idle was messed up a little, it might actually sound better. I would love to have a fake "lope" due to poor idle. I might then try some of the others to compare the performance. It should be pretty easy to re-sell the ones I don't like.

 

A misfire and a "lope" sound completely different from each other. Misfires do not sound good...

 

I make my own spacers out of Baltic birch plywood. I've found the 4 hole 1/2 spacer works best of mine. Wood is a good heat shield.
clint

 

Put an open spacer on my dual plane and went .10 quicker.

 

Instructions? What are those?

I have thought of making my own out of good plywood, but feared the wood would absorb moisture or fuel. Did you treat it after you made it, or was it fine untreated?

Is that "Baltic Birch" special in some way, or can I use any good (non-white pine) plywood?

 

A four hole spacer would give you better results, a four hole tapered spacer would give you excellent results!!

Don't double up on the gaskets unless you glue them together with some kind of gasket shellac.......If you are worried about heat soak into the carburetor, just run a composite spacer plate or a heat shield under the carb.

Get rid of the Edelbrock carb. and get a holley/demon and you'll really tell a difference!

 

Sometimes you can lower the idle enough that a small cam will sound big.
Just make sure it is low idle, but still enough to keep running in all situations.
Doesn't really work well with a stock cam though.

 

I used the Baltic Birch because is has fewer voids than normal plywood. I did'nt treat it but imagine you could find something to soak it in that would'nt hurt anything. Maybe Boiled linseed oil would work.
I've been making and using them for myself and others for a couple years with only an accasional problem, like cracks in a couple around the bolt holes when I tried using solid maple,
clint