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#1 |
Registered User
Join Date: Feb 2012
Location: Wichita, KS
Posts: 41
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Carb Question
I just bought a truck that was kind of thrown together by one of the previous owners. It has an Edelbrock 1407 (750 cfm) carburetor on a stock 73 350. The carb needs to be rebuilt, its not acting quite right. I am thinking that the carb is kinda big for the engine. Can it be metered down for a little better efficiency or should I just find a smaller carb, maybe with electric choke, to put on the engine?
Also, is there a good place to pick up a throttle cable for the truck? Thanks, Nate |
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#2 |
Registered User
Join Date: Feb 2009
Location: Wausau, WI
Posts: 975
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Re: Carb Question
what is it doing that is acting up?
how many cfm do you think the carb is? i'd say you could pick one up cheap at a local parts store. |
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#3 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,936
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Re: Carb Question
You can't "meter down" a carb. You need a 600 cfm carb for your application.
You can always sell the 750 that's on there now and put it towards a new 600. Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#4 |
Registered User
Join Date: Feb 2012
Location: Wichita, KS
Posts: 41
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Re: Carb Question
The truck will only run with the choke mostly engaged
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#5 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,936
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Re: Carb Question
Then you have a wicked vacuum leak.
Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#6 |
Registered User
Join Date: Jul 2011
Location: vacaville ca
Posts: 1,304
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Re: Carb Question
carbs way big for a stock small block but like stated you have other issues
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04 CHEVY LLY LS DURAMAX 4WD. MODS TO FOLLOW, EFI LIVE, BUILT TRANS, LBZ MP, LIFT PUMP SOLD 1972 chevy c10 |
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#7 |
Registered User
Join Date: Feb 2012
Location: Wichita, KS
Posts: 41
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Re: Carb Question
Alright so I'm new to the carb world, but trying to learn. So to get the engine to idle reliably i can just plug the vacuum ports on the carb? If i understand correctly this will just prevent my brake booster from working and vacuum advance on the distro. Is the PCV valve unrelated to vacuum?
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#8 |
Registered User
Join Date: Mar 2008
Location: Powhatan, Va.
Posts: 376
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Re: Carb Question
If you have power brakes they need to be connected to the booster, make sure that hose is in good shape. You need to have the vacuum advance connected and the PCV needs to be connected to vacuum too, you also need to make sure the crankcase has a way to pull in fresh air. The massive leak Gary is talking about could be between the carb and the manifold, the manifold and heads or any of the vacuum hoses if they are old. You can spray some carb cleaner around the base of the carb and along the manifold gaskets, if the idle picks up then that is where your leak is. Hope this helps.
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Sean "If your gonna be dumb, you gotta be tough" 1960 Chevy Impala Sedan - my 25 year search is over!! 1969 C-10 longbed - Nice day DD ![]() 1970 Chevy Nova - Street and Strip Project ![]() 2002 Acura MDX my DD 2007 Honda Odssey - My Wife's "Mommy Van" |
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#9 |
Registered User
Join Date: Feb 2012
Location: Wichita, KS
Posts: 41
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A few more questions
Alright. I got a used Holley 1850 cleaned and rebuilt it. The truck started right up I've done a little timing work, I haven't yet done the whole timing procedure, verifying TDC and all that. But my issue now is that my vacuum secondaries aren't working. I used the paperclip trick and took the truck for a drive. Now this is on a stock '73 350, Is there a chance that the engine doesn't require enough air to open the secondaries? I guess I should buy a vacuum gauge and check the vacuum.
I'm also using an adapter from square bore to spreadbore, I know this isn't the best solution. Would it help to put on an aftermarket intake manifold? (edelbrock performer) I do plan on either rebuilding this engine or building a separate engine and swapping it in. So i could just wait to get a new engine to buy an intake manifold. Thanks for the help, Nate |
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Tags |
carb, carburetor, throttle |
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