Red Coupe
Member
I know its not the HP move, but an Edelbrock tech just told me that it may not be possible to completely cure the bog in my current set up.
Any thoughts?
Any thoughts?
Has anyone swapped a Holley in place of an Edelbrock on a 340?
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Red Coupe
Member
I want to install a Holley instead of the Edel...
I edited your title.
Woodys_Cuda
Ontario, Canada
Yes, I have 3 holleys on my 340, no bog.
If you answer post #2 you might get more help..
If you answer post #2 you might get more help..
Professor Fate
Push the button, Max...
I think the Eddy tech you had on the phone was doing 'shrooms.
LOL!
Yeah there should be enough Eddy parts available to tune the bog out of the Eddy. Metering rods, jets, step up springs, there’s a lot of things to work with.
I know they don’t offer all the different step options for their metering rods that they used to, but there’s still ways to deal with that. Or track down an old strip kit if you’re sure you need one of the old metering rod dimensions.
Sounds like the tech doesn’t know how to do it, which is not the same as it not being possible.
You have told Us nothing, except an embarrassment of a 'Tech' has basically said...."sorry our carbs suck, You'll have to buy a competitor's carb to fix it", ..........
We can neither recommend a particular carb, or help You diag. the issue with no info,....help Us help You.
What model Eddy carb are You using? What are the engine details? Ign. system & timing settings? What have You tried so far? Did this exist from the get-go, or pop-up recently, and were there changes made just before/concurrent with the issue?
Plymouth 65
I'll be in the shop
That's hard to believe but nothing surprises me anymore. I have both brand carborater's on my 340's and find both can be tuned to what the engine requires. Either use an AFR Gauge or learn how to read plugs. 65
How big is the Cam your using?
Inertia
Well-Known Member
Holley was one of the first improvements that the 1970 Mopar Hustle Catalog recommended, and is one of the first improvements I do to most 340s
But I think you need to finda better tech, although I prefer Holley for misc reasons, a good tech should be able to diagnose and repair the AVS .
jmo
But I think you need to finda better tech, although I prefer Holley for misc reasons, a good tech should be able to diagnose and repair the AVS .
jmo
Make sure yo get a 4 corner idle circuit carburetor if going with a holley. Especially if it has a larger cam. you will be able to idle off the secondaries . Otherwise you will be drilling holes in the primary venturi valves as pictured to keep the primaries squared. Also good to get one with removable air bleeds so you can fine tune it with the carb in place. Quick fuel carbs work good for me . but Holley proform are good. Just more cash.
Holley style carb are much easier to fine tune then a carter style for the novice. Air fuel gauge and a screw driver, some air bleeds and you will be a carb expert. Quick fuels are usually pretty close out of the box.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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Be sure you know the difference between a "bog" and a tip-in hesitation. Each is cured differently.
Other important factors are;
fuel-level, pump timing, Ignition timing, valve lash and even cylinder pressure.
Red Coupe
Member
Hey, sorry guys for not answering your questions sooner!
Problem-- If you flat foot it, it goes dead lean for a second or so. Right off idle, or rolling, makes no difference.
carb AVS 1906
cam specs - see pic
heads - ebrock RPM (stock)
I do have a AFR gage installed
Street driven-- done w/ drags, at least for now.
Tuning steps - see pic - I followed the ebrock carb tuning guide. In short, it idles fine, part throttle fine, cruse fine. Right now I'm one step rich on jet/rod on primaries from stock. Tried richer secondaries, but did not help.
Air valve - adjusted so it hits fine, except on WOT
The ebrock tech suggested going to the silver springs and continue to play with the air valve. He did say this it's possible to still have some bog.
What I'm asking is it possible to use an adapter to put a Holley on the existing e brock manifold. I know it won't be ideal.
Thanks in advance for any advice/help/suggestions.
TT5.9mag
Two atmospheres are better than one
I’ve replaced every Edelbrock or AVS or AFB or Thermoquad on every car I’ve ever owned with a Holley. I usually give them away. But, if you know how to tune one, you can get rid of the tip in sag, or bog, or lean cough that most of them have out of the box.
Professor Fate
Push the button, Max...
What adapter? A square bore carb is a square bore carb. No adapters needed unless you're trying to mix and match square bore and spread bore manifolds and carbs.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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And then you get to tune the Holley.........
In my 11/1, Eddy-headed 367 is a similar Hughes cam, and I run an Airgap, currently, with a Holley. I like it.
But, that engine has run two other intakes and about 4 other carbs, including a TQ and a Carter AVS . All of them required tuning. All of them were ok with my timing curve, maybe because it was doggone close, lol.
If you have BOTH a tip-in hesitation and a bog, then fix the tip-in sag first.
That cam , with a manual trans, will NOT like hiway gears from a dead-stop. Nor a low stall convertor.
I run a 3.09 low gear, and 3.55s giving me a starter-gear of ~11/1, which is more than adequate, with my Hi-Torque 367.
If your asking your 340 to go WOT at sub 2000, yur gonna have to slow those Secondaries down. The Primaries of a 600 are good to near 3000 rpm, so not much sense having the secondaries go WOT too much before then. It's just gonna cause the airspeed to crash.
If you wanna drive like that, (I mean sure I do) then yes, get a Double Pumper, and be be prepared to modulate your gas-pedal to Not blow the tires off. and
don't get angry when you find out that your fuel-consumption has gone way up. And put some money away to cover the tickets that you might get, lol
In my 11/1, Eddy-headed 367 is a similar Hughes cam, and I run an Airgap, currently, with a Holley. I like it.
But, that engine has run two other intakes and about 4 other carbs, including a TQ and a Carter AVS . All of them required tuning. All of them were ok with my timing curve, maybe because it was doggone close, lol.
If you have BOTH a tip-in hesitation and a bog, then fix the tip-in sag first.
That cam , with a manual trans, will NOT like hiway gears from a dead-stop. Nor a low stall convertor.
I run a 3.09 low gear, and 3.55s giving me a starter-gear of ~11/1, which is more than adequate, with my Hi-Torque 367.
If your asking your 340 to go WOT at sub 2000, yur gonna have to slow those Secondaries down. The Primaries of a 600 are good to near 3000 rpm, so not much sense having the secondaries go WOT too much before then. It's just gonna cause the airspeed to crash.
If you wanna drive like that, (I mean sure I do) then yes, get a Double Pumper, and be be prepared to modulate your gas-pedal to Not blow the tires off. and
don't get angry when you find out that your fuel-consumption has gone way up. And put some money away to cover the tickets that you might get, lol
Last edited:
It sounds like a pump shot issue. Make sure the accelerator pump rod that comes from the throttle linkage is in the hole closest to the carburetor in the accelerator pump lever.
Red Coupe
Member
A few more things to know:
This is a new build
The pump shot is set to max
I run a fuel pressure regulator set at 6 lbs
I'm running the 31 squirter
3.55 gears
This is a new build
The pump shot is set to max
I run a fuel pressure regulator set at 6 lbs
I'm running the 31 squirter
3.55 gears
Red Coupe
Member
So a Holley will just bolt up? How about intake brackets?
Professor Fate
Push the button, Max...
Okay, an Eddy 1906 is a 650 cfm AVSII. Pretty dang good carb, right out of the box. Get your primaries squared away then address your air valve and pump shot.
You can go ahead and slap on a Holley, but be prepared to learn how to tune those, too.
Professor Fate
Push the button, Max...
The only thing you have to change/add is the Holley Mopar throttle lever adapter, similar to the one you put on your Edelbrock carb. (You DID use the Eddy throttle adapter, right?)
https://www.holley.com/products/fue...20-7?msockid=1e548c0d192d6f59311b825718856ef0
Professor Fate
Push the button, Max...
You might have too big of a shot.
Eddy carbs don't like more than 5 lbs of pressure.
Double check your float level.
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