| Carb and Intake [message #131259] |
Tue, 21 June 2011 10:36  |
biggreen
Messages: 347
Registered: June 2011
Location: Northeast Florida
Karma: 1
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Senior Member |
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Good morning, all.
Looking to rebuild or replace my carb and intake manifold.
Have a 403, so I've heard an Edelbrock Performer intake will fit with no floor modification. Which specfic performer (they make several) is best for the GMC?
I assume I would have to get an electric choke.
Jim B's website says will rebuild carb for about $300. Anything special about this rebuild pertaining to our application, or could I just buy a new aftermarket (Edelbrock, Holley, etc)?
Any wisdom would be appreciated. Thanks.
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| Re: [GMCnet] Carb and Intake [message #131266 is a reply to message #131259] |
Tue, 21 June 2011 10:52  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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The Quadrajet on the engine is jetted and calibrated for the 403 in low speed hi torque service. An aftermarket likely won't be. I'd build it and put it back. And if I wasn't intamitely familiar with the Quadrajet (I'm not) I'd let Jim K or Jim B or one of the gurus do it, it's worth the loot.
One day - but not today - I may redo mine with a ThermoQuad or an AFB. God and Carter made good carburetors :):)
-johnny
--- On Tue, 6/21/11, R.D. Hart <regor5556@yahoo.com> wrote:
From: R.D. Hart <regor5556@yahoo.com>
Subject: [GMCnet] Carb and Intake
To: gmclist@temp.gmcnet.org
Date: Tuesday, June 21, 2011, 3:36 PM
Good morning, all.
Looking to rebuild or replace my carb and intake manifold.
Have a 403, so I've heard an Edelbrock Performer intake will fit with no floor modification. Which specfic performer (they make several) is best for the GMC?
I assume I would have to get an electric choke.
Jim B's website says will rebuild carb for about $300. Anything special about this rebuild pertaining to our application, or could I just buy a new aftermarket (Edelbrock, Holley, etc)?
Any wisdom would be appreciated. Thanks.
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Carb and Intake [message #131297 is a reply to message #131259] |
Tue, 21 June 2011 13:15 |
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I've had good luck with my street avenger by holley. But watch out for ethanol gas. It messed up my secondaries. The new Aluminum body avengers should be ok with it...
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: Carb and Intake [message #131309 is a reply to message #131259] |
Tue, 21 June 2011 13:55 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| biggreen wrote on Tue, 21 June 2011 10:36 |
Good morning, all.
Looking to rebuild or replace my carb and intake manifold.
Have a 403, so I've heard an Edelbrock Performer intake will fit with no floor modification. Which specfic performer (they make several) is best for the GMC?
I assume I would have to get an electric choke.
Jim B's website says will rebuild carb for about $300. Anything special about this rebuild pertaining to our application, or could I just buy a new aftermarket (Edelbrock, Holley, etc)?
Any wisdom would be appreciated. Thanks.
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For information on carb and rebuilding...
http://gmcmotorhome.info/engine.html#carb
scroll down and read Brent Covey comments...
Dick Paterson is the most recognized carb rebuilder should you decide to send it out -- but it (reportedly) has to be a real GMC carb, because of the unique features.
Folks have reported succeess with other carbs -- but with the original it is easier to get help from this group or from the vendors.
The main advantage of pulling the manifold might be to block the exhaust crossover.
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: Carb and Intake [message #131329 is a reply to message #131328] |
Tue, 21 June 2011 16:43 |
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jaholland
Messages: 565
Registered: June 2010
Location: Sweet Home Alebamy
Karma: 0
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Senior Member |
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| biggreen wrote on Tue, 21 June 2011 16:28 |
Was it the Big Green that tipped you off?  Yes 77 in NE Fla. I thought the block off plates blocked the crossover. I've heard of having them filled. Whats the advantage? Thanks for the info.
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biggreen;
Advantages ?
~> 2 MPG
~> Cooler Running
~> Better Vacuum
Check the photos to see the intake manifold
before and after I had the exaust crossover plugged ~
https://www.facebook.com/media/set/?set=a.1697369155175.2087795.1266255830&l=259797f926
~ Joe ~
/_]*[__][] *[__|] ~ * '73 TZE063V101887 "
"
O----------OO--]* ~ '78 TZE168V100234 "
"
" Joe & Lavelle " "
"
'sweet home alebamy'
[Updated on: Tue, 21 June 2011 16:46] Report message to a moderator |
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| Re: [GMCnet] Carb and Intake [message #131336 is a reply to message #131259] |
Tue, 21 June 2011 18:43 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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RD,
Send your carb up to Dick Patterson in Canada, I GA-RON-TEE you will be
happy with his workmanship! Come to think of it while you're at it send him
your distributor so he can re-curve it, when you refit those two items you
WILL NOT believe how much better your GMC will perform. I sure was!
http://www.springfield-ignition.com/
I have a 455 in my GMCs and wouldn't know if the Performer will fit without
raising the floor or not. I would plug the crossovers and under no
circumstances use the cast iron plugs that come with the manifold. They
messed up Ken H's heads big time. I can't seem to find the pictures.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of R.D. Hart
Sent: Wednesday, June 22, 2011 1:37 AM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Carb and Intake
Good morning, all.
Looking to rebuild or replace my carb and intake manifold.
Have a 403, so I've heard an Edelbrock Performer intake will fit with no
floor modification. Which specfic performer (they make several) is best for
the GMC?
I assume I would have to get an electric choke.
Jim B's website says will rebuild carb for about $300. Anything special
about this rebuild pertaining to our application, or could I just buy a new
aftermarket (Edelbrock, Holley, etc)?
Any wisdom would be appreciated. Thanks.
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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