Over carbed?
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Elder User
Joined: Aug 2008
Posts: 638
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From: El Segundo, CA.
Over carbed?
I've got a 390 with a holley 650 , stock everything else as far as I can tell.
How can i be certain it's too much carb for the beast.
I am planning a HE conversion, will this possably cure the bogging blues?
How can i be certain it's too much carb for the beast.
I am planning a HE conversion, will this possably cure the bogging blues?
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
Ya, thinking the same thing bear. Probably stomp on it and it falls on it's face. Get a 600 vacuum version.
Slow speed driving is probably great, but you'll see the problem the first time you use WOT.
Slow speed driving is probably great, but you'll see the problem the first time you use WOT.
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Elder User
Joined: Aug 2008
Posts: 638
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From: El Segundo, CA.
I have the same problem in my Bronco with a 351M...I bought the Holley 4150 650cfm electric choke vac. secondaries. But I over carbed for a reason. And I'm gonna fix it the only way I know how, cam, headers, 400 crank. Nothing like a few more ponies to fix the problem. Since you said yours is relatively stock, instead of getting a new carb to correct the bogging, I would throw a little extra money at it and go with a few performance goodies.
Lead Driver
Joined: Jan 2003
Posts: 9,893
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From: Ohio
It's gunno take alot of stall convertor(and gearing) to get rid of the bog. Double pumpers are just not good street carbs for trucks. Wayy to heavy and slow. A good tuned vacuum carb will out run it every day.
Notice his Bronco has a vacuum sec. carb on it.
Notice his Bronco has a vacuum sec. carb on it.
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Joined: Jul 2002
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From: Long Island USA
Either that, or learn where the secondaries open and stop stomping right past it 
You don't need full throttle (even with just the primaries) to get full power off-idle. If you lean into it, with a quick partial snap right at the start, you could learn to deal with it
Try dual side-draft Webers on a 4-cylinder. You learn real fast where the bog line is...
You don't need full throttle (even with just the primaries) to get full power off-idle. If you lean into it, with a quick partial snap right at the start, you could learn to deal with it
Try dual side-draft Webers on a 4-cylinder. You learn real fast where the bog line is...
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Logistics Pro
Joined: Oct 2005
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From: Mddl A MexCans
Either that, or learn where the secondaries open and stop stomping right past it
You don't need full throttle (even with just the primaries) to get full power off-idle. If you lean into it, with a quick partial snap right at the start, you could learn to deal with it
Try dual side-draft Webers on a 4-cylinder. You learn real fast where the bog line is...
You don't need full throttle (even with just the primaries) to get full power off-idle. If you lean into it, with a quick partial snap right at the start, you could learn to deal with it
Try dual side-draft Webers on a 4-cylinder. You learn real fast where the bog line is...
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Cargo Master
Joined: Aug 2000
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From: SW Michigan
carbs and ignition
Wiked, a 650 is not even close to too big for a 390. But if you do in fact have a doublepumper, those aren't considered truck friendly. If you have a bog from the DP opening the throttles too quickly, that would not be a surprize. But a HEI conversion, if that is what you meant, will not help. HEI is just junk stuff for a chevy. The problem they have is that all of the brains for the thing is cooking inside of the dizzy. A better way to go would be a nice duraspark with extra bushings .....the folks who sell HEI conversions probably have them.....and then your trigger box can be out in the breeze someplace. I used to like a Standard Motors LX101 box, but I don't think those are USofA made anymore. But the old ones I have still work. DinosaurFan
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Either that, or learn where the secondaries open and stop stomping right past it
You don't need full throttle (even with just the primaries) to get full power off-idle. If you lean into it, with a quick partial snap right at the start, you could learn to deal with it
Try dual side-draft Webers on a 4-cylinder. You learn real fast where the bog line is...
You don't need full throttle (even with just the primaries) to get full power off-idle. If you lean into it, with a quick partial snap right at the start, you could learn to deal with it
Try dual side-draft Webers on a 4-cylinder. You learn real fast where the bog line is...
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Even the 360 horsepower 352 didn't run that big of a carb. I would suspect you just didn't know what to look for, to know how badly over carburated it was.
Lead Driver
Joined: Jan 2003
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From: Ohio
Well I run a Vac 750 on my stock 352.......BUT.............I basically use it as a 375 cfm 2bbl carb. It don't pull enough vacuum to open the secondaries(or turn enough rpm). It purrs like a kitten, idles smoother then any Autolite carb. I had it, I used it, works fine.
Had I needed to BUY a carb, it would have been a 600 vac Holley. I basically used what I had laying around.
Had I needed to BUY a carb, it would have been a 600 vac Holley. I basically used what I had laying around.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Well I run a Vac 750 on my stock 352.......BUT.............I basically use it as a 375 cfm 2bbl carb. It don't pull enough vacuum to open the secondaries(or turn enough rpm). It purrs like a kitten, idles smoother then any Autolite carb. I had it, I used it, works fine.
Had I needed to BUY a carb, it would have been a 600 vac Holley. I basically used what I had laying around.
Had I needed to BUY a carb, it would have been a 600 vac Holley. I basically used what I had laying around.
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