Carb recommendation for my needs - Team Camaro Tech
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post #1 of 16 (permalink) Old Apr 18th, 15, 11:25 PM Thread Starter
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Carb recommendation for my needs

Hi everyone,

I just picked up a 67 Camaro. It has a crate 350 with a mild cam and a 700R transmission. The current carb is a Holley 750cfm 4barrel double pumper with no choke.

I've been told this carb is too big for my motor and that a 650 cfm with vacuum secondary would suit it better.

My application is mainly street, so good torque and decent fuel economy is my goal (for now).

In the near future I'm considering building a 383 stroker. So I guess my question is, should I switch over to the recommended Holley 650 cfm with vacuum secondary and electric choke, and if I do, will this carb still work well with a 383 stroker?

All advice is appreciated! Thanks!
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post #2 of 16 (permalink) Old Apr 19th, 15, 08:21 AM
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Re: Carb recommendation for my needs

For a good street carb I would go with a Holley Street Avenger. I'm sure you will get several opinions on which carb to choose. http://www.summitracing.com/parts/hly-0-80670/overview/

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post #3 of 16 (permalink) Old Apr 19th, 15, 09:11 AM
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Re: Carb recommendation for my needs

I think the 750 can be tuned for the 350(pain in the butt) but would be easier to tune with the 383. The 650 will work easier for both but you may give up some hp(not much) with the 383. I guess it depends how radical you build the 383 also.
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post #4 of 16 (permalink) Old Apr 19th, 15, 09:25 AM
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Re: Carb recommendation for my needs

I am not one to answer questions on with little experience but I'm in a similar boat. I have a mild 350 and I'm putting on the Demon 650 vac sec since I read their cfm is underrated. It's advertised for mild 302-427 motors so I figure 350 is in the middle. Not the most technical logic I guess.

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post #5 of 16 (permalink) Old Apr 19th, 15, 11:04 AM
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Re: Carb recommendation for my needs

I agree...650VS carb would be better for your goals

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post #6 of 16 (permalink) Old Apr 19th, 15, 11:18 AM
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Re: Carb recommendation for my needs

I tried a 650 sec/vac Holley on my 70 Z28 when it had a cr of 9:1 and it ran out of fuel/air at 5,000 rpm. I'd sell the 750 dp and get yourself a 750 with sec/vac.

Mark 70 Z28 M22 3.73 Z21 Z87 - Lunati 20120121 Roller Cam

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post #7 of 16 (permalink) Old Apr 19th, 15, 12:59 PM
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Re: Carb recommendation for my needs

The 3310 (750) vac secondary is a pretty versatile, all around carb--you can tune it to run well with your 350, and it will have enough CFM to run your 383 once you upgrade. Might be worth a look for you...

Keith
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post #8 of 16 (permalink) Old Apr 19th, 15, 03:41 PM
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Re: Carb recommendation for my needs

Quote:
Originally Posted by keithl1967 View Post
the 3310 (750) vac secondary is a pretty versatile, all around carb--you can tune it to run well with your 350, and it will have enough cfm to run your 383 once you upgrade. Might be worth a look for you...
x2.

Don
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post #9 of 16 (permalink) Old Apr 19th, 15, 07:58 PM Thread Starter
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Re: Carb recommendation for my needs

Thanks everyone for your responses. Seems there's quite a few different opinions on this. If and when I do go 383 I'm not going to go all out crazy on it. I still need it to run reliably and mainly for street use. Just looking for that extra "fun factor" when I want it if you know what I mean.
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post #10 of 16 (permalink) Old Apr 19th, 15, 08:34 PM
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Re: Carb recommendation for my needs

Go with a new design : the street demon 625 cfm is setup to work with your 700R4. Read the reviews from people who have bought it.

http://www.amazon.com/Demon-1901-Electric-Polymer-Carburetor/dp/B008EL4DC8

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post #11 of 16 (permalink) Old Apr 21st, 15, 01:54 AM Thread Starter
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Re: Carb recommendation for my needs

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Originally Posted by Lawrence454 View Post
Go with a new design : the street demon 625 cfm is setup to work with your 700R4. Read the reviews from people who have bought it.

Amazon.com: Demon 1901 625 CFM Electric Choke Polymer Street Demon Carburetor: Automotive
That carb looks interesting and has some great reviews. 2 local mechanics recommended I go with the Holley 650cfm vac secondary tho. Tried and true or new and cool? Hard to decide....

I don't really want to have to do this twice.
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post #12 of 16 (permalink) Old Apr 21st, 15, 03:06 AM
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Re: Carb recommendation for my needs

Quote:
Originally Posted by cozen89 View Post
That carb looks interesting and has some great reviews. 2 local mechanics recommended I go with the Holley 650cfm vac secondary tho. Tried and true or new and cool? Hard to decide....

I don't really want to have to do this twice.
Here is a nice article on the street demon :
http://www.hotrod.com/how-to/engine/...fm-carburetor/

And a forum where people relay their experience with it :

http://www.hotrodders.com/forum/new-...rb-223299.html

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post #13 of 16 (permalink) Old Apr 21st, 15, 07:49 PM
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Re: Carb recommendation for my needs

cozen89,

I just put a Holley Street Demon 625 on my 350 HO and I love it! Starts great, easy to tune and has plenty of power. Also it is already setup of a 700r4 trans which shifts properly with this setup.

I would highly recommend this carb for the street.

-Joe

1969 Camaro V8 Base Model, Black w/White Rally Stripes, 350 HO w/ FiTech Go 4 600, HEI, 700r4 trans, 10 Bolt 4:10 Rear End, 15" Rally Wheels, 245/60/15 Rear, 235/60/15 Front

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post #14 of 16 (permalink) Old Apr 22nd, 15, 01:10 PM Thread Starter
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Re: Carb recommendation for my needs

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Originally Posted by BadCo69 View Post
cozen89,

I just put a Holley Street Demon 625 on my 350 HO and I love it! Starts great, easy to tune and has plenty of power. Also it is already setup of a 700r4 trans which shifts properly with this setup.

I would highly recommend this carb for the street.

-Joe
The feedback definitely sounds great for a 350, but I don't see much about this carb with a 383. This will be my only hesitation as it will definitely be stroked in the near future.
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post #15 of 16 (permalink) Old Apr 22nd, 15, 03:23 PM
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Smile Re: Carb recommendation for my needs

A square bore 750 cfm, IMHO is too big on the street for a 350 ci engine. A 625 or 650 cfm is too small for a 383.

The street Demon is not a square bore carburetor, it is a spread bore carburetor, meaning the primaries are smaller than the secondaries.

I would run either a Quadrajet or the street Demon 750 cfm if you want to be able to use it on a 383 later on.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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