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12-05-2007 04:38 PM #1
carb ?
I have a 350 chevy with these modifications.280h cam,aluminum dualplane intake.headers.I have a 4150(750 dual feed). the problem Ihave if it is a problem is the motor seems to run rich.the exhaust smells real richI donot know if this is from the bigger cam or maybe too big a carb or possibly i need to upgrade the stock hei ignition.any ideas would be appriciated
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12-05-2007 04:44 PM #2
Go to something around 600 cfm, and I bet you will be a lot happier.
Don
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12-05-2007 04:45 PM #3
Originally Posted by Itoldyouso
Yes,go 600 cfm.
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12-05-2007 08:28 PM #4
The best 600 Holley ever made for 350 is # 6619 if you can find one.
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12-05-2007 09:05 PM #5
Holley tuning
Because of the cam change I would try going down one or two sizes on the power valve,also down two sizes on primary jets,should put you in the ballpark.
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12-06-2007 06:42 AM #6
Originally Posted by DennyW
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12-06-2007 07:15 AM #7
ahh .. spend 10 thousand more dollars and make the motor big enuff to fit the carb
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12-06-2007 07:23 AM #8
Or spend $ 200 and put the correct one on it.
Don
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12-06-2007 08:24 AM #9
Originally Posted by DennyW
You sound to much like my wife and you are starting to scare me.
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12-06-2007 08:36 AM #10
Yep---why not spend $15 to fix the carb he has ? It might not be the ideal size but it can certainly be made to run better than it does
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12-06-2007 12:50 PM #11
I appriciate the input.It sounds like the carb is the problem.being from mi. I have probably about 4 months to figure out to either fix or replace the carb. as far as building a motor to fit the carb I would love too.Ihave less than 4 k invested in this truck so far and have a budget to stay in.down the road I would like to tub it and put a blown big block in it.but at this time its just a dream (everyones got to have a dream)you folks seem to know your stuff
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12-06-2007 01:31 PM #12
Does it smell till ur eyes water on idle,i have the same problem,sorry no fix,i've got a 460 with 800 hollley,big problem!
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12-06-2007 05:30 PM #13
I'd get rid of the dual feed on the street, get vacuum secondaries, a 750 daul pump with mechanical secondaries is going to shove to much gas down a 350, get a 600-650 with vacuum secs, will only take what it needs, unless you have to light of a spring.
I like Q-Jets!
PatHemiTCoupe
Anyone can cut one up, but! only some can put it back together looking cool!
Steel is real, anyone can get a glass one.
Pro Street Full Fendered '27 Ford T Coupe -392 Hemi with Electornic Hilborn injection
1927 Ford T Tudor Sedan -CPI Vortec 4.3
'90 S-15 GMC pick up
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01-14-2008 06:20 PM #14
denny the model is a 3310S I have purchased a 600 cfm holly and it seams to run cleaner and crisper.I havent had a chance to drive the truck on the road since I rebuilt the motor and installed new carb( too much snow in michigan)
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01-15-2008 12:33 AM #15
Right out of the box . The Carter AFB (aka) Edelbrock Performer is the better 600CFM Carburetor . A Holley 1850 600CFM needs lots of work done to it . so it can give any kind of performance .
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Welcome to CHR. I think that you need to hook up your vacuum advance. At part throttle when cruising you have less air and fuel in each cylinder, and the air-fuel mixture is not as densely packed...
MSD 8360 distributor vacuum advance