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10-15-2007, 04:20 PM
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#1 |
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Registered User
 
Join Date: Aug 2007
Location: Sachse, Texas
Posts: 614
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Best size for carb?
I've got a mild performance 350(325hp) and need a new carb. Any suggestions for cfm? Currently it has a 600cfm Holley.
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10-15-2007, 05:05 PM
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#2 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Best size for carb?
have the holley rebuilt its a good carb perfect size
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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10-15-2007, 05:16 PM
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#3 |
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Registered User
Join Date: Aug 2007
Location: Sachse, Texas
Posts: 614
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Re: Best size for carb?
had a couple guys that don't build cars or anything tell me that I should use a 750 dp
 I was thinking about rebuilding the 600, just got some junk in it from the old gas tank......
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10-15-2007, 05:33 PM
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#4 |
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Chevy nut
Join Date: Jun 2007
Location: Springfield, Illinois
Posts: 2,266
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Re: Best size for carb?
Stay with the 600. If you have a radical cam and bore and stroke...then you need a bigger carb. Mild to stock...no more than a 650.
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84 Chevy Custom Deluxe 1/2 Ton Named Fade To Black II "Remember kids there is NO replacement for displacement!" |
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10-15-2007, 05:53 PM
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#5 |
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Old Skool Club
Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Best size for carb?
My vote is for the same carb that I have....an Edelbrock Q-Jet @750CFM. I've had mine on my truck for five years and haven't touched one time. Divorced choke has started it every time. No bog. No flooding. No trouble.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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10-15-2007, 05:56 PM
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#6 |
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Registered User
Join Date: Aug 2007
Location: Sachse, Texas
Posts: 614
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Re: Best size for carb?
cool, never rebuilt one... guess I'll go pull it off and get started....
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10-15-2007, 05:58 PM
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#7 |
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Registered User
Join Date: Aug 2007
Location: Sachse, Texas
Posts: 614
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Re: Best size for carb?
I assume it's junk from the gas tank.... it started running rough and backfiring.... has not been driven in close to a year, I run the engine every day or two....
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10-15-2007, 06:00 PM
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#8 | |
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Registered User
Join Date: Apr 2007
Location: King City, Ontario, Canada
Posts: 974
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Re: Best size for carb?
Quote:
have a 750 on a smaller stroke/bore, you may as well take the ignition switch out, 'cause you would be able to kill it with your foot. 
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- Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men. |
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10-15-2007, 07:27 PM
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#9 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,992
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Re: Best size for carb?
I think the 600-650 is about right.You can use a bigger carb but the vacuum signal will be better with the smaller carb.You will probably benefit some in fuel milage from the smaller carb.
Now if you were drag racing or running flat out a lot you could benefit from a larger carb.Since most street cruising is done at part throttle the smaller carb should help keep the air velocity up and give you better PT response.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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10-15-2007, 07:34 PM
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#10 |
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Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,814
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Re: Best size for carb?
Based on all of these questions recently I decided to write a FAQ
http://67-72chevytrucks.com/vboard/s...d.php?t=262656 |
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10-15-2007, 08:21 PM
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#11 | |
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Active Member
Join Date: Apr 2005
Location: Miami, Florida
Posts: 286
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Re: Best size for carb?
Quote:
You might want to think about using 2 fuel filters, one before the fuel pump and the second before the carb. Try to use something other then $12.00 clear one with a cruddy paper element. Here is a simple formula for figuring CFM Rpm x displacement divided by 3,456 6000 x 350/3,456 = 607.64 your 600cfm Holley carb is spot on.
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"The Great State of Florida" Last edited by KFreddy; 10-15-2007 at 08:28 PM. |
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10-15-2007, 08:54 PM
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#12 |
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Registered User
Join Date: Jun 2005
Location: Rehoboth Beach De
Posts: 10
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Re: Best size for carb?
So in your opinion, should i have a 650 dp or 700 for a mild 383 stroker. Using both formulas i came up with just a little over 650? Thanks for the help.
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10-15-2007, 09:20 PM
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#13 |
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Registered User
Join Date: Dec 2006
Location: Trinidad, Colorado
Posts: 642
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Re: Best size for carb?
Unless it's High RPM and big CUBES.......I would NEVER put anything on my truck but a Q-JET!!!!! Its 750 only when needed......It was used by the factory for EVERYTHING from a 305 to a 454. When 4-wheeling, it is only beaten by fuel injection! AND...if you're not into the secondaries...fuel economy is AWESOME.
BEST NON RACE CARB.......BAR NONE!!!!!! FOR ANY SIZE ENGINE!  A.........
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10-15-2007, 09:24 PM
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#14 |
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Nothing to see here.....
Join Date: Jun 2007
Location: Shawnee, KS
Posts: 4,625
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Re: Best size for carb?
my vote for an Edelbrock 600cfm. for a stock 350 with standard internals, 600 will work without a doubt....
my .02 |
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10-16-2007, 02:26 AM
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#15 |
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Registered User
Join Date: Apr 2007
Location: Fayetteville, NC
Posts: 83
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Re: Best size for carb?
This is what you need Performer RPM Intake, Edelbrock 600cfm Electric choke
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