Carb Spacer help - what's on your intake

Brand Carb Spacer

  • Wilson Spacer

    Votes: 2 7.4%

  • Super Sucker

    Votes: 7 25.9%

  • Jomar

    Votes: 1 3.7%

  • Holley

    Votes: 2 7.4%

  • Generic

    Votes: 7 25.9%

  • none

    Votes: 8 29.6%
  • Total voters
    27
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cudajames

cudajames

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Getting ready to start another project on my car – installing a 6 pack hood scoop. With my new found space, I am looking to install a 1” carb spacer. Performance gains are always welcome

Setup
408
RPM Airgap with a Holley 850dp
Cam 241/247 @50 with 545 lift
Eddy heads - cleaned up
10 to 1 compression

Currently looking at the jomar 5016-x (phenolic wood) or the Super Sucker SS4150-1AL (aluminum)((very expensive))

There are 1000s to choose from. Is there really a differences between the upmarket Super Sucker or Wilson compared to the Summit or Spectre Performances

What about materials, phenolic, aluminum, plastic or just wood. And don’t forget tapered

Most of the dyno test show very little difference between the 1” and 2”

What is everyone using? Any real world numbers/experience would be appreciated
 
Last edited:
Are you sure a 1" would be welcomed by your engine?? Carb spacers are usually trial and error. I've had cars at the track go the fastest with the carb bolted directly on top of the intake, others liked a spacer.
 
I do not know, it will be trail and error. I am working to put some research and education before the trail
 
Carb spacer requirement (or the the lack thereof) is combination specific. Post your entire setup’s specs and you may get input from a helpful someone with a similar combination who has already done the trial and error testing for you.
 
Car weight and gearing? Standard procedure with a dual plane is to start with a one inch four hole spacer and work up from there.
 
See Test #1 1" open spacer was best. IMM 408
I run a 1" 4 hole after trying open, etc. Stock stroke 340 no where near the bottom end TQ you have.
 
No dyno experience here James, just what worked for me on my stock stroke 360. A 1 inch tapered Wilson phenolic resin unit. The cam was a little stouter @ 248@050.

In messing around with spacers, I have noticed that there is most always a good response when the carb butterflies are moved upwards above the intake manifold.

As it is often said, your results may vary. Being you have a stroker, the extra cubes tend to like more plenum.

OH! The best material to use for preventive heat transfer is wood followed by Phenolic Resin.

cudajames said:
Getting ready to start another project on my car – installing a 6 pack hood scoop. With my new found space, I am looking to install a 1” carb spacer. Performance gains are always welcome

Setup
408
RPM Airgap with a Holley 850dp
Cam 241/247 @50 with 545 lift
Eddy heads - cleaned up
10 to 1 compression

Currently looking at the jomar 5016-x (phenolic wood) or the Super Sucker SS4150-1AL (aluminum)((very expensive))

There are 1000s to choose from. Is there really a differences between the upmarket Super Sucker or Wilson compared to the Summit or Spectre Performances

What about materials, phenolic, aluminum, plastic or just wood. And don’t forget tapered

Most of the dyno test show very little difference between the 1” and 2”

What is everyone using? Any real world numbers/experience would be appreciated
Click to expand...
 
yellow rose said:
As a general rule, if a spacer helps, you have other issues.

If anything, you can try a shear plate, but it's a bunch of work to make those work.
Click to expand...
True! Not enough plenum is one.
A really big engine with not enough intake.
This is where a MP/TR or the Indy intake comes in rather handy. There very good for big engines.

Below are some pictures of the MP/TR and the Edelbrock STR (Street Tunnel Ram) and there plenum differences.
Both are a hell of an intake when used in there respective parameters.
If, IF! I was to use one of these below on your engine, it would be the Edelbrock STR.
01055897-204F-40EF-A748-54D43F959594.jpeg
050CAB1D-66BE-4874-8554-4107D497E628.jpeg
53CED96E-809F-484F-A3A7-F709C7A50A80.jpeg
741749F2-D122-4A91-B2A3-83EC8F8C8C8D.jpeg
83A66483-E5C6-4E00-9BFF-466BF7612725.jpeg
B5E3BFF8-710F-4AE2-9F15-4493FFE97DA1.jpeg
 
rumblefish360 said:
True! Not enough plenum is one.
A really big engine with not enough intake.
This is where a MP/TR or the Indy intake comes in rather handy. There very good for big engines.

Below are some pictures of the MP/TR and the Edelbrock STR (Street Tunnel Ram) and there plenum differences.
Both are a hell of an intake when used in there respective parameters.
If, IF! I was to use one of these below on your engine, it would be the Edelbrock STR.
View attachment 1715492720 View attachment 1715492721 View attachment 1715492722 View attachment 1715492723 View attachment 1715492724 View attachment 1715492727
Click to expand...


Yeah, the Edelbrock TR is about as good a street tunnel ram as it gets.
 
I agree. I think that would be best on a low rpm stroker or a mid to high-ish rpm stock stroke engine.
But James has a rpm.

@cudajames , is your RPM-AG ported?
 
The air gap has not been ported at this time.

Part of my motivation is to raise the carb/air cleaner above the hood for the scoop
 
That was a good article in most cases even gave the jetting changes. In this case the motor liked the $25 spacer, it lost some in the lower end and picked it up backup toward the upper end
 
That’s about normal for a spacer to act like that.

Is just funny how some people complain about the low end performance of an engine in varying degrees while there running cams @ .248@.050 and larger, single plane intakes, big for barrels, etc....
Let’s face it. If your running this kind of equipment, your not concerned with low end power. If anybody was concerned, they need a dual plane and a smaller Hyd. cam.
:rofl:
 
rumblefish360 said:
That’s about normal for a spacer to act like that.

Is just funny how some people complain about the low end performance of an engine in varying degrees while there running cams @ .248@.050 and larger, single plane intakes, big for barrels, etc....
Let’s face it. If your running this kind of equipment, your not concerned with low end power. If anybody was concerned, they need a dual plane and a smaller Hyd. cam.
:rofl:
Click to expand...


And...the big question really is...what is low end power? If you think you want all the power you can hook at just off idle you live in a fools paranoid.

You have to have a reasonable definition of bottom end. Most guys don't.
 
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