Carburetor choice - Team Camaro Tech
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post #1 of 20 (permalink) Old Jun 20th, 15, 07:21 PM Thread Starter
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Jim
 
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Carburetor choice

Is there a general rule of thumb for choosing carburetor size to cubic inches for a somewhat mild street motor?
The motor in question is a .30 over 427 with an Edlebrock Air Gap in front of a manual transmission. The motor was built by a friend very long ago and I don't quite remember cam specs or compression but I believe about 9.5 to 1 compression.
Thanks in advance, Jim
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post #2 of 20 (permalink) Old Jun 20th, 15, 07:59 PM
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Scott
 
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Re: Carburetor choice

There are plenty of calculators on the web to help get an idea of carburetor size. Just do a Google search for "Carburetor CFM Calculator" or click on the link below and you'll come up with a number of them that you can use to help narrow down your choices.

http://www.google.com/?gws_rd=ssl#q=...CFM+Calculator

These should get you in the ball park as far as sizing goes.

69 Camaro Z/28 RS, original Azure Turquoise, M21 & 3.73 12-bolt posi. NOM 406ci, AFR 210 heads, Straub hyd. roller cam & Dynatech 1-3/4" > 1-7/8" headers, QuickFuel 750 Annular. Photos at:
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post #3 of 20 (permalink) Old Jun 20th, 15, 08:45 PM
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Re: Carburetor choice

If this is just a street car and not seeing a LOT of high rpm runs I prefer to go on the smaller size. You may leave a few horses on the table but it will be easier to tune. I like the 750 for a 427, just my opinion though.
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post #4 of 20 (permalink) Old Jun 20th, 15, 10:55 PM Thread Starter
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Re: Carburetor choice

Thanks, after looking through a few of them, bigblockragtop has a good suggestion with a 750.
Thanks again, Jim
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post #5 of 20 (permalink) Old Jun 21st, 15, 03:57 AM
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Re: Carburetor choice

750 ..

Cheers
Steve

Steve
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post #6 of 20 (permalink) Old Jun 21st, 15, 08:33 AM
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Re: Carburetor choice

Give the guys at AED a call or email.
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post #7 of 20 (permalink) Old Jun 21st, 15, 11:52 AM
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Tom
 
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Smile Re: Carburetor choice

An 800 CFM Quadrajet from SMI ! The best way to get great street performance !

https://www.smicarburetor.com/produc...ID2/9/sfID3/33

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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post #8 of 20 (permalink) Old Jun 21st, 15, 01:46 PM
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Anne
 
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Re: Carburetor choice

Quote:
Originally Posted by 4Speed67CamaroRS View Post
Is there a general rule of thumb for choosing carburetor size to cubic inches for a somewhat mild street motor?
The motor in question is a .30 over 427 with an Edlebrock Air Gap in front of a manual transmission. The motor was built by a friend very long ago and I don't quite remember cam specs or compression but I believe about 9.5 to 1 compression.
Thanks in advance, Jim
The cam has a lot to do with carb selection.

A 750 is great for a mild street build; I especially like the street demon 750 which is an updated quadrajet-type carb which should deliver good gas mileage and performance.
https://www.youtube.com/watch?v=IHWJpZCmUAk

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post #9 of 20 (permalink) Old Jun 21st, 15, 05:21 PM
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Joe
 
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Re: Carburetor choice

Quote:
Originally Posted by TJS69 View Post
An 800 CFM Quadrajet from SMI ! The best way to get great street performance !

https://www.smicarburetor.com/produc...ID2/9/sfID3/33
+1

Hard to beat a properly set up QJ. They are excellent carbs. GM put Quadrajets on millions of cars & trucks for a good reason

The important thing here is that you ask me what kind of car I've got. "I've got a BITCHIN' CAMARO"
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post #10 of 20 (permalink) Old Jun 22nd, 15, 12:07 AM Thread Starter
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Re: Carburetor choice

I see a lot of props for a Quadrajet. I never gave one much thought. Always figured a Holley was the way to go. I'll have to rethink that I guess.
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post #11 of 20 (permalink) Old Jun 22nd, 15, 12:15 AM
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Tom
 
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Smile Re: Carburetor choice

For Racing it is tough to beat Holley's, but on the street it is tough to beat a Quadrajet.

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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post #12 of 20 (permalink) Old Jun 22nd, 15, 12:54 AM Thread Starter
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Re: Carburetor choice

Quote:
Originally Posted by Lawrence454 View Post
The cam has a lot to do with carb selection.

A 750 is great for a mild street build; I especially like the street demon 750 which is an updated quadrajet-type carb which should deliver good gas mileage and performance.
https://www.youtube.com/watch?v=IHWJpZCmUAk
I watched the video and it's definitely making me consider it. Any other opinions in regards to the street demon?
Thanks, Jim
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post #13 of 20 (permalink) Old Jun 22nd, 15, 09:30 AM
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Anne
 
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Re: Carburetor choice

Quote:
Originally Posted by 4Speed67CamaroRS View Post
I watched the video and it's definitely making me consider it. Any other opinions in regards to the street demon?
Thanks, Jim
Team Chevelle has many pleased owners of the street demon.

The street demon has several updated features that make it superior to a quadrajet IMHO. Holley owns and makes the street demon.

Government's first duty is to protect the people, not run their lives.
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post #14 of 20 (permalink) Old Jun 22nd, 15, 08:16 PM
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Re: Carburetor choice

SCS Performance Carbs.

1967 camaro, 327, 9.7 CR, comp cam xs274solid, vortec cylinder heads, edelbrock vortec performer rpm, 750 annular carb, HVH 2" spacer, msd pro billet w/6A box, turbo 350 trans, 3500 stall, 4:10 gears, caltracs suspension, m/t drag radials.
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post #15 of 20 (permalink) Old Jun 22nd, 15, 10:26 PM
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mike
 
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Re: Carburetor choice

Lots of good carbs out there you just have to tune them to your specific engines liking.
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