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#551150 - 03/30/08 08:08 AM Benifits of a carb spacer?
Silver85 Offline
Member

Registered: 12/02/07
Posts: 301
Loc: Summersville, West Virginia
What are the pros and cons of running a carb spacer? I have read that they help with top end performance, but do they take away from the low end? Im thinking of trying one out but want to read some input first.
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85 Silver SS, T-Tops, 335 Stroker, Eddy 4bbl, Holley Street Dominator intake, mild cam, W/ Vortecs, headers, and posi rear ASAP
GREAT! Gift from my Dad
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#551157 - 03/30/08 08:28 AM Re: Benifits of a carb spacer? [Re: Silver85]
Monte_ExpreSS Online   moon
Member

Registered: 12/16/07
Posts: 3759
Loc: Oshawa, Ont. Canada
The open spacers help with top end power, & the 4 hole help with low end torque. For a street car, go with a 4 hole.
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#551160 - 03/30/08 08:36 AM Re: Benifits of a carb spacer? [Re: Monte_ExpreSS]
cj84ss Offline
10+ Year
Member

Registered: 11/02/03
Posts: 3350
Loc: Jacksonville, Fl.
x2 4 hole for the street and open for top end hp.
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1984 SS, w/87 Grand National 2004R, 355 vortec, CCC, Crane XE262.
1969 Road Runner
2003 GMC Serria

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#551167 - 03/30/08 09:20 AM Re: Benifits of a carb spacer? [Re: cj84ss]
SD Concepts Offline
Member

Registered: 02/03/11
Posts: 380
Loc: West Warwick, RI
It makes the intake maniold think its bigger than it really is...some engines like them, some see no gains, or a loss of performance. Every engine is different, a dyno is the only way to see for sure how your engine reacts.

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#551171 - 03/30/08 09:23 AM Re: Benifits of a carb spacer? [Re: cj84ss]
ProTourAero Offline
Member

Registered: 06/12/05
Posts: 744
Loc: Chesterton, IN
There is a spacer that starts out as a 4 hole & tapers into an open spacer. In every case we have used one on an engine on our dyno it has helped all around power w/o hurting torque or HP.
Below is an example of the spacers Wilson makes, they are also made by other companies.

http://www.wilsonmanifolds.com/shop/index.php?l=product_images&p=9


I have one of these on my engine.
_________________________

1987 Monte Carlo SS Aerocoupe "Pro Touring", 436ci All Alum. SBC, 18 Aluminum Heads, 700R4, 3000stall, Ford 9 inch, 3.90 gears, 620 H.P., 590 FT LBS Torque. E.T. 11.229 @ 123.62 on motor. 10.213 @ 137.58 NOS (10/02/2010)!
www.protouraero.com

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#551172 - 03/30/08 09:23 AM Re: Benifits of a carb spacer? [Re: cj84ss]
Silver85 Offline
Member

Registered: 12/02/07
Posts: 301
Loc: Summersville, West Virginia
Can I run a 4 hole spacer with my open intake?
_________________________
85 Silver SS, T-Tops, 335 Stroker, Eddy 4bbl, Holley Street Dominator intake, mild cam, W/ Vortecs, headers, and posi rear ASAP
GREAT! Gift from my Dad
The Car-/-The Motor


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#551192 - 03/30/08 10:31 AM Re: Benifits of a carb spacer? [Re: Silver85]
SS402 Offline
Member

Registered: 02/06/08
Posts: 4656
Loc: Beaverton, Oregon
sure, the carb has 4 holes so your just just making the carb flange thicker by using a 4-hole spacer..
A tapered 4-hole spacer can provide the best of both worlds

performer rpm intakes require a special unit that has a window machined into it designed to enhance cross-flow across the divider.


Here is my HVH tapered 4-hole with a window..






and the matching intake manifold


On my engine combination the spacer can add up to 40hp..
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George
Monte, Gone but not forgotten

The More I Learn About Dogs
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#551209 - 03/30/08 11:03 AM Re: Benifits of a carb spacer? [Re: SS402]
jigsaw Offline
Member

Registered: 09/02/07
Posts: 3174
Loc: Laredo TX
are all brands different or are spacers just spacers?

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#551224 - 03/30/08 11:34 AM Re: Benifits of a carb spacer? [Re: jigsaw]
SS402 Offline
Member

Registered: 02/06/08
Posts: 4656
Loc: Beaverton, Oregon
open, 4-hole, tapered 4-hole,
they come in varying thickness..
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George
Monte, Gone but not forgotten

The More I Learn About Dogs
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#551399 - 03/30/08 08:52 PM Re: Benifits of a carb spacer? [Re: SS402]
MY FYN 79 Offline
Moderator
10+ Year

Member

Registered: 11/12/02
Posts: 9761
Loc: N/E WI
Hmm, thats interesting about the spacer being different for an Edelbrock RPM intake. It must not be "required" because I run a regular tapered 4 hole Wilson on mine, but that is an interesting piece of info. Did that info come from High Velocity Heads? Also, do they charge more for it? \:\)
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79 Monte - Sold 5-11-13
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#551406 - 03/30/08 09:05 PM Re: Benifits of a carb spacer? [Re: MY FYN 79]
SS402 Offline
Member

Registered: 02/06/08
Posts: 4656
Loc: Beaverton, Oregon
all i can tell you is i used one on "the other project"
and it made a world of difference..
Never compared with a standard open or 4-hole unit so
don't know if it's better, but it works for me..
It's not required for the manifold but it does
compliment the existing setup..
Roughly $135 online..
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George
Monte, Gone but not forgotten

The More I Learn About Dogs
The Less I Like About People

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#551412 - 03/30/08 09:10 PM Re: Benifits of a carb spacer? [Re: MY FYN 79]
Buick Runner Offline
Member

Registered: 05/06/07
Posts: 3946
Loc: Dharma station 1 the Hydra
You may also want to think about phenolic spacers that help keep the carb cooler.


Edited by Buick Runner (03/30/08 09:10 PM)
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SBC powered 1987 Regal with TES headers, ZZ4 intake, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.

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#551475 - 03/30/08 11:36 PM Re: Benifits of a carb spacer? [Re: Buick Runner]
SS402 Offline
Member

Registered: 02/06/08
Posts: 4656
Loc: Beaverton, Oregon
Absolutely, phenolic spacers can add performance by keeping the carburetor cooler, use a fuel cooler to maximize the benefits of a dense mixture...combine all these techniques and you maximise HP with the chosen selection of parts..
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George
Monte, Gone but not forgotten

The More I Learn About Dogs
The Less I Like About People

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#552092 - 04/01/08 05:03 PM Re: Benifits of a carb spacer? [Re: SS402]
TigerSpeed Offline
Member

Registered: 01/04/08
Posts: 61
Loc: Greenville, SC
is there a specific application one for holley street avenger carbs? all i'm seeing is the 4150 and 4500 series.

or can i just use one of those?
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86 Monte Carlo SS - Computer Delete, Holley 670 Street Avenger, Flowmaster Exhaust

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#552109 - 04/01/08 05:52 PM Re: Benifits of a carb spacer? [Re: TigerSpeed]
SS402 Offline
Member

Registered: 02/06/08
Posts: 4656
Loc: Beaverton, Oregon
the street avenger is a 4150..
what manifold do you have..?
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George
Monte, Gone but not forgotten

The More I Learn About Dogs
The Less I Like About People

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#552296 - 04/02/08 01:32 AM Re: Benifits of a carb spacer? [Re: SS402]
TigerSpeed Offline
Member

Registered: 01/04/08
Posts: 61
Loc: Greenville, SC
don't know yet. haven't decided between Holley street dominator, Edelbrock performer,
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86 Monte Carlo SS - Computer Delete, Holley 670 Street Avenger, Flowmaster Exhaust

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#552521 - 04/02/08 07:00 PM Re: Benifits of a carb spacer? [Re: TigerSpeed]
SS402 Offline
Member

Registered: 02/06/08
Posts: 4656
Loc: Beaverton, Oregon
both of those are low-rise dual-plane intakes, that
motor won't turn enough rpm to benefit from a spacer..

if you were serious about makin power i'd recommend
a 4-hole tapered, but not with those manifolds..
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George
Monte, Gone but not forgotten

The More I Learn About Dogs
The Less I Like About People

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#552530 - 04/02/08 07:28 PM Re: Benifits of a carb spacer? [Re: SS402]
Gamester Offline
Member

Registered: 12/02/07
Posts: 472
Loc: Right by the Rocky Mountains
 Originally Posted By: SS402
On my engine combination the spacer can add up to 40hp..


Wow, I have always thought that those carb spacers were just one of those "rip off" products that didn't actually do anything. Guess I was wrong.

How many inches tall of one should I get for my Holley 770CFM Street Avenger carb and Holley Street Dominator intake?

Thanks,
Jason
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1985 Monte Carlo SS/w 350SBC - SOLD frown

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#552577 - 04/02/08 09:35 PM Re: Benifits of a carb spacer? [Re: Gamester]
SS402 Offline
Member

Registered: 02/06/08
Posts: 4656
Loc: Beaverton, Oregon
It depends on the appication...

I was afraid this would happen, just because i run a spacer on my engine some of you might think your engine needs one too.
This is not the case unless your building or have a serious street engine, spacers are designed to add power on top.
the rpm where valve overlap is minimized, air-flow is maximized
and the engine really starts to pull like a freight train on steroids..
This is when the tapered spacer really starts to shine by correcting and shaping the air-flow into the plenum..

If ya gotta high-rise and 270 debgrees of advertised duration ur probably a good candidate for the unit.
Otherwise ur most likely wasting ur time n money..

That's the way i see it dawg..


Edited by SS402 (04/02/08 09:39 PM)
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George
Monte, Gone but not forgotten

The More I Learn About Dogs
The Less I Like About People

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#552594 - 04/02/08 10:13 PM Re: Benifits of a carb spacer? [Re: SS402]
Gamester Offline
Member

Registered: 12/02/07
Posts: 472
Loc: Right by the Rocky Mountains
Hmm, well I don't have a high rise intake, but my advertised duration on my soon to be installed Comp cam is 268/280. Do you think I would be fine without a spacer, or would I benefit from one?

Here is some interesting results about spacers on a smaller engine than mine. Yea, it is a Ford, but interesting results none the less...

http://www.fordmuscle.com/forums/tech-exchange/465957-carb-spacers-dyno-test-1964-falcon-302-a.html

Thanks,
Jason


Edited by Gamester (04/02/08 10:32 PM)
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1985 Monte Carlo SS/w 350SBC - SOLD frown

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#552720 - 04/03/08 10:53 AM Re: Benifits of a carb spacer? [Re: Gamester]
SS402 Offline
Member

Registered: 02/06/08
Posts: 4656
Loc: Beaverton, Oregon
i'd recommend switching to a high-rise dual-plane...then check out a spacer if ya like what the new manifold does to the powerband....glad to see you researched a little and found out that i'm not just passin gas...lol
15-40hp depending on application

George


Edited by SS402 (04/03/08 10:54 AM)
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George
Monte, Gone but not forgotten

The More I Learn About Dogs
The Less I Like About People

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#552754 - 04/03/08 12:23 PM Re: Benifits of a carb spacer? [Re: SS402]
TigerSpeed Offline
Member

Registered: 01/04/08
Posts: 61
Loc: Greenville, SC
So if i have the holley 670 and edelbrock performer, I would probably benefit most if i just got a 4 hole spacer up to an inch, maybe less? It would also be a benefit just for the fact of the heat transfer, right?

It's a street/strip car mostly street. Is it really even worth the spacer in my application?
_________________________
86 Monte Carlo SS - Computer Delete, Holley 670 Street Avenger, Flowmaster Exhaust

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#552804 - 04/03/08 02:56 PM Re: Benifits of a carb spacer? [Re: TigerSpeed]
SS402 Offline
Member

Registered: 02/06/08
Posts: 4656
Loc: Beaverton, Oregon
 Originally Posted By: TigerSpeed
It would also be a benefit just for the fact of the heat transfer, right?

that would be your biggest advantage, .25" or .5" phenolic..
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George
Monte, Gone but not forgotten

The More I Learn About Dogs
The Less I Like About People

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#552828 - 04/03/08 04:30 PM Re: Benifits of a carb spacer? [Re: SS402]
Gamester Offline
Member

Registered: 12/02/07
Posts: 472
Loc: Right by the Rocky Mountains
Sorry for my ignorance, but how do you tell if you have a high rise dual-plane intake or not? Just wondering, because shape and height wise, my intake looks a lot like yours George. Mine looks like it has the same basic style of divider and internal structure as yours does, from what I can tell in your picture anyways. I'll get a picture up later if necessary, at work right now.

Thanks,
Jason


Edited by Gamester (04/03/08 04:40 PM)
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1985 Monte Carlo SS/w 350SBC - SOLD frown

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#552859 - 04/03/08 06:21 PM With a Q-Jet............ [Re: Silver85]
rolex517 Offline
Member

Registered: 10/11/06
Posts: 87
Loc: Richmond, VA
Would a 4-hole benifit me at all on my stock chevy intake (I will put it on my edelbrock later)?

Jess
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