What size Carb is too big? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cruzito1 · 06-05-2009, 11:10 AM

I have a 63 chevy truck with 71 camaro 350 camaro engine on it. Im putting a scoop on through the hood, so I was trying to put something shiny and cool. I've seen 700cmf 650, and 600. There is a super cool 750 cmf that has enduro shine. is that too big? The guy selling it said it made his truck too sluggish, like it was flooding or something like that.

Well my question really is what is the biggest carb I can put on my truck with the engine 350 I got out of a 71 camaro?

Bears63 · 06-05-2009, 11:51 AM

It really depends on what goodies you have in the engine. Here's a couple examples: My '63 C10 has a bone stock 350. It's a run of the mill crate engine. I have a 600 cfm Edelbrock 4 bbl on it and it is just fine. My '71 also has a bone stock 350, and it's also running great with a 600 cfm Edelbrock 4bbl. In both cases I have great throttle response on these motors, no hesitations, flooding, or any issues at all. If you have a big cam and other goodies in the engine then you will want a bigger carb. I would say no bigger than 700 cfm if the engine is stock though. Just my opinion from my experiences with my putt-putt daily drivers.

MacAttack · 06-05-2009, 12:20 PM

^^^^^ Same - Same ^^^^^ on my 65' Chevelle: 0 to 100 MPG (indicated - when I thought the front end was going to fall off) perfectly smooth.

Mac.

joe231 · 06-05-2009, 01:50 PM

dang Mac you get 100 MPG with a '65 Chevelle? the auto makers are doing something wrong

I have heard no more than 2cfm per cubic inch... 350ci X 2cf = 700cfm max for a stock-ish 350

MacAttack · 06-05-2009, 02:03 PM

Quote:

Originally Posted by joe231

dang Mac you get 100 MPG with a '65 Chevelle? the auto makers are doing something wrong

Do'h: MPG = MPH

Mac.

Tx Firefighter · 06-05-2009, 04:23 PM

You can run a 750 on a basically stock 350 no problem. Make sure it is a vacuum secondary carb though, not a mechanical secondary.

You will be much happier with a 600 cfm carb though. They may not look as impressive, but they perform better on a 350.

ruffrida2005 · 06-05-2009, 09:11 PM

I'm running a 750 on close to a 400HP 350. If you get a smaller carb and it's not right you can always jet it out. I had a 625 demon on it that was jetted to the largest jets it would take.

**Captainfab** · 06-06-2009, 12:20 AM

The CFM is going to give you RPM capability.....there's a formula to figure that out.....I'd have to look for it.

Regardless of the CFM size of the carb, you may need to change jets, powervalves, accelerator pump cams, etc for your engine to run correctly(proper amount of fuel).

With that said I would have to agree that you would be best off to go with a 600-625CFM carb for your 350. It will more than likely be real close to correct for your engine. That will give you more than enough RPM capability for a 350 and you can 'tune' the carb to suit your engine if needed.

**Captainfab** · 06-06-2009, 12:22 AM

Quote:

Originally Posted by MacAttack

^^^^^ Same - Same ^^^^^ on my 65' Chevelle: 0 to 100 MPG (indicated - when I thought the front end was going to fall off) perfectly smooth.

Mac.

I think we all want to see a pic of this carb Mac......

cruzito1 · 06-07-2009, 02:14 AM

These are the two adds I was looking at:

Demon 625 cfm with electric choke. $175

Mallory Ignition, Unilite Breakerless Distributor Part number 3748201. Comes with extra module and wiring diagram. Works with Chevrolet 283, 327 and 350 engines. Ready to install, very good condition. Asking $75.00 OBO.

Theres a guy selling a Demon, it looks pretty cool. I really want the shinny finish, so it will match the polished scoop thats gonna go through the hood. The reason I was asking was there was an edelbrock 750 with enduro shine for 175 also. Thats pretty much all I can spend with out my wife tripping and wanting to divorce me over my truck. She was already tripping cause I was looking at a Mallory Distributor for 75 bucks.

dolphman88 · 06-07-2009, 02:31 AM

its kinda one of those things.. if you have to ask.. stick with a 600. who cares about endurashine anyways... just get a shiny air cleaner!

ruffrida2005 · 06-07-2009, 11:47 AM

That demon is what i was running on my motor. It was jetted out, and I have a built motor and it was running good. I think you would be really happy with it. Mine needs a new power valve. I dont know how much they cost. I would sell you mine for about $100

oldblu65 · 06-07-2009, 12:33 PM

Holley has a carb size calculator on their web site . Just enter your info and it'll tell you the optimum size carb for your application .

MacAttack · 06-08-2009, 02:01 PM

Quote:

Originally Posted by Captainfab

I think we all want to see a pic of this carb Mac......

Here it is........

06-05-2009, 11:10 AM	#1
cruzito1 Registered User Join Date: Feb 2006 Location: San Diego Posts: 10	What size Carb is too big? I have a 63 chevy truck with 71 camaro 350 camaro engine on it. Im putting a scoop on through the hood, so I was trying to put something shiny and cool. I've seen 700cmf 650, and 600. There is a super cool 750 cmf that has enduro shine. is that too big? The guy selling it said it made his truck too sluggish, like it was flooding or something like that. Well my question really is what is the biggest carb I can put on my truck with the engine 350 I got out of a 71 camaro?

06-05-2009, 11:51 AM	#2
Bears63 ...just another truck junkie.. Join Date: May 2009 Location: Watertown, SD Posts: 698	Re: What size Carb is too big? It really depends on what goodies you have in the engine. Here's a couple examples: My '63 C10 has a bone stock 350. It's a run of the mill crate engine. I have a 600 cfm Edelbrock 4 bbl on it and it is just fine. My '71 also has a bone stock 350, and it's also running great with a 600 cfm Edelbrock 4bbl. In both cases I have great throttle response on these motors, no hesitations, flooding, or any issues at all. If you have a big cam and other goodies in the engine then you will want a bigger carb. I would say no bigger than 700 cfm if the engine is stock though. Just my opinion from my experiences with my putt-putt daily drivers. __________________ Mike "Bear" Shea

06-05-2009, 12:20 PM	#3
MacAttack 283 Drama Queen Join Date: Dec 2004 Location: Surf City, CA Posts: 2,435	Re: What size Carb is too big? ^^^^^ Same - Same ^^^^^ on my 65' Chevelle: 0 to 100 MPG (indicated - when I thought the front end was going to fall off) perfectly smooth. Mac. __________________ For about 12 years of my adult life I had a severe speech impediment. My ex-wife never let me get a word in edgewise.

06-05-2009, 01:50 PM	#4
joe231 Registered User Join Date: Dec 2007 Location: Palmer, Alaska Posts: 13,821	Re: What size Carb is too big? dang Mac you get 100 MPG with a '65 Chevelle? the auto makers are doing something wrong I have heard no more than 2cfm per cubic inch... 350ci X 2cf = 700cfm max for a stock-ish 350 __________________ *CHEVY ONLY* Last edited by joe231; 06-05-2009 at 01:51 PM.

06-05-2009, 04:23 PM	#6
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: What size Carb is too big? You can run a 750 on a basically stock 350 no problem. Make sure it is a vacuum secondary carb though, not a mechanical secondary. You will be much happier with a 600 cfm carb though. They may not look as impressive, but they perform better on a 350. __________________ I'm on the Instagram- @Gearhead_Kevin Last edited by Tx Firefighter; 06-05-2009 at 04:24 PM.

06-05-2009, 09:11 PM	#7
ruffrida2005 Member of the longbed union. Join Date: Feb 2009 Location: Killeen, Tx Posts: 2,158	Re: What size Carb is too big? I'm running a 750 on close to a 400HP 350. If you get a smaller carb and it's not right you can always jet it out. I had a 625 demon on it that was jetted to the largest jets it would take. __________________ Paul 88 GMC Crew Cab dually, 454/T400 64 LWB 400 HP 350/350T Bagged, under construction! Sold most of it! 92 S10 Iron Duke 5 speed, 5/7 drop for now. soon to be bagged. Sold http://67-72chevytrucks.com/vboard/s...59#post4637759

06-06-2009, 12:20 AM	#8
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: What size Carb is too big? The CFM is going to give you RPM capability.....there's a formula to figure that out.....I'd have to look for it. Regardless of the CFM size of the carb, you may need to change jets, powervalves, accelerator pump cams, etc for your engine to run correctly(proper amount of fuel). With that said I would have to agree that you would be best off to go with a 600-625CFM carb for your 350. It will more than likely be real close to correct for your engine. That will give you more than enough RPM capability for a 350 and you can 'tune' the carb to suit your engine if needed. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

06-07-2009, 02:14 AM	#10
cruzito1 Registered User Join Date: Feb 2006 Location: San Diego Posts: 10	Re: What size Carb is too big? These are the two adds I was looking at: Demon 625 cfm with electric choke. $175 Mallory Ignition, Unilite Breakerless Distributor Part number 3748201. Comes with extra module and wiring diagram. Works with Chevrolet 283, 327 and 350 engines. Ready to install, very good condition. Asking $75.00 OBO. Theres a guy selling a Demon, it looks pretty cool. I really want the shinny finish, so it will match the polished scoop thats gonna go through the hood. The reason I was asking was there was an edelbrock 750 with enduro shine for 175 also. Thats pretty much all I can spend with out my wife tripping and wanting to divorce me over my truck. She was already tripping cause I was looking at a Mallory Distributor for 75 bucks.

06-07-2009, 02:31 AM	#11
dolphman88 DDOV Join Date: Sep 2008 Location: North Wilkesboro, NC Posts: 210	Re: What size Carb is too big? its kinda one of those things.. if you have to ask.. stick with a 600. who cares about endurashine anyways... just get a shiny air cleaner! __________________ If you don't like the way I drive, stay off the sidewalk http://67-72chevytrucks.com/vboard/s...d.php?t=317070 The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

06-07-2009, 11:47 AM	#12
ruffrida2005 Member of the longbed union. Join Date: Feb 2009 Location: Killeen, Tx Posts: 2,158	Re: What size Carb is too big? That demon is what i was running on my motor. It was jetted out, and I have a built motor and it was running good. I think you would be really happy with it. Mine needs a new power valve. I dont know how much they cost. I would sell you mine for about $100 __________________ Paul 88 GMC Crew Cab dually, 454/T400 64 LWB 400 HP 350/350T Bagged, under construction! Sold most of it! 92 S10 Iron Duke 5 speed, 5/7 drop for now. soon to be bagged. Sold http://67-72chevytrucks.com/vboard/s...59#post4637759

06-07-2009, 12:33 PM	#13
oldblu65 Registered User Join Date: Jul 2005 Location: " The Scenic City " Posts: 189	Re: What size Carb is too big? Holley has a carb size calculator on their web site . Just enter your info and it'll tell you the optimum size carb for your application .

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