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Author Topic:   Carb spacer: open plenum or 4-hole?
FASTFORD
Gearhead

Posts: 105
From: USA
Registered: Aug 2002

posted 10-21-2002 04:54 PM     Click Here to See the Profile for FASTFORD   Click Here to Email FASTFORD     Edit/Delete Message   Reply w/Quote
On my 289 with holley 600 cfm 4bbl, edelbrock performer manifold, headers and duals: should I get open or 4-hole carb spacer, also 1" or 2"? Thanks

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1967 Mustang coupe
originally a c-code 289 with a c-4 tranny, I added holley 600cfm 4bbl, edelbrock performer intake manifold, hooker headers, and dual flowmaster exhaust. interior is stock with a kenwood cd player

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Moneymaker
Administrator

Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 10-21-2002 04:56 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
4 hole one inch.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

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Fastymz
Moderator

Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 10-21-2002 05:00 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
I'd go with the 4hole 1",thats what worked best for me at least.

SCOOP

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2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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FASTFORD
Gearhead

Posts: 105
From: USA
Registered: Aug 2002

posted 10-21-2002 05:05 PM     Click Here to See the Profile for FASTFORD   Click Here to Email FASTFORD     Edit/Delete Message   Reply w/Quote
Some of the spacers have a hole in them on the side, like some kind of hose is supposed to go there. what do I do about that?
How much is the spacer going to help my car run better, is it worth any HP?
thanks

[This message has been edited by FASTFORD (edited 10-21-2002).]

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Moneymaker
Administrator

Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 10-21-2002 05:49 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
The hole is for a vaccum nipple to be used for power brakes or a PCV.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"

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johnmustang
Gearhead

Posts: 6197
From: British Columbia , Canada
Registered: Nov 2001

posted 10-21-2002 06:13 PM     Click Here to See the Profile for johnmustang   Click Here to Email johnmustang     Edit/Delete Message   Reply w/Quote
I had the open 1" on my 289 with the autolite 4100 1.08 venturi. Changed to the 4 hole 1" and it does work better for my car , don,t really know why , but , it does.


JOHN

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65 2+2 FASTBACK
68 COUPE (SOLD)
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK

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FASTFORD
Gearhead

Posts: 105
From: USA
Registered: Aug 2002

posted 10-21-2002 06:39 PM     Click Here to See the Profile for FASTFORD   Click Here to Email FASTFORD     Edit/Delete Message   Reply w/Quote
do I plug that hole (vacuum nipple) ?

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Fastymz
Moderator

Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 10-21-2002 07:52 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by FASTFORD:
do I plug that hole (vacuum nipple) ?

Yes plug it.

SCOOP

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2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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FASTFORD
Gearhead

Posts: 105
From: USA
Registered: Aug 2002

posted 10-21-2002 09:15 PM     Click Here to See the Profile for FASTFORD   Click Here to Email FASTFORD     Edit/Delete Message   Reply w/Quote
thanks a lot...I'll get a 1", 4-hole spacer and plug the vacuum hole. Sounds like a cheap and easy mod. Just one more thing...Can I expect any horsepower or anything else from this...in other words, what are the benefits of a carb spacer?
Thanks again

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MrWesson22
Gearhead

Posts: 1286
From: Dacula, GA
Registered: Sep 2000

posted 10-21-2002 11:24 PM     Click Here to See the Profile for MrWesson22   Click Here to Email MrWesson22     Edit/Delete Message   Reply w/Quote
Me too.... what spacer should I run? Currently I don't have room for any, but I'm looking into getting a CJ scoop and cutting the hood underneath shortly. It's a 351C 4V running a torker and holley 770. The cam's 244/[email protected]"

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Neal

69 Gulfstream Aqua Grande
351C/4sp
https://mustangsandmore.com/ubb/MrWesson22.html

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Fastymz
Moderator

Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001

posted 10-22-2002 01:53 AM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Neal,Scoops are always glad to here it.
I'd still go with the 1" 4 hole spacer.

SCOOP

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2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede.

https://mustangsandmore.com/ubb/Fastymz.html

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64FalconF-16
Gearhead

Posts: 233
From: Republic Of Texas!! Temporarily living in KY
Registered: Feb 2002

posted 10-22-2002 09:55 AM     Click Here to See the Profile for 64FalconF-16   Click Here to Email 64FalconF-16     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by MrWesson22:
Me too.... what spacer should I run? Currently I don't have room for any, but I'm looking into getting a CJ scoop and cutting the hood underneath shortly. It's a 351C 4V running a torker and holley 770. The cam's 244/[email protected]"



On a Cleveland you definitly need a 4 hole spacer. It gave me a little more bottom end torque. At least the 60 ft time relected it. It also makes it more responsive.

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64 Pro-Street Falcon
351C 4V 8.1s in 1/8
79 Ford Bronco 4 X 4 Lifted 6"
400 9.9s in 1/8 :)
70 Plymouth Cuda'
440 Magnum. 2600#
Race Car 6.90 in 1/8

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SteveLaRiviere
Administrator

Posts: 45869
From: Saco, Maine
Registered: May 99

posted 10-25-2002 08:01 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by johnmustang:
I had the open 1" on my 289 with the autolite 4100 1.08 venturi. Changed to the 4 hole 1" and it does work better for my car , don,t really know why , but , it does.


JOHN


It strengthens the vacuum signal {pull} at the base of your throttle bores, making your idle transfer slots work better.

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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