Thoughts on the 670 holley

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..he says he knows everything about the Holley carburetors... self professed experts gives me the willies.. also sounds like he has an axe to grind..

I have followed a few threads but they usually end up with a different problem....not the carb.

Holley has sold boatloads of these..if thee was a major defect, I suspect Holley would react..

I'll know in a couple of months..

ian.
 
I see that the port for the pvc hose is in the front and there is another port for power brakes in the rear can i use the rear for my pvc?
 
Snake said:
I see that the port for the pvc hose is in the front and there is another port for power brakes in the rear can i use the rear for my pvc?
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There are two large ports and one small port for intake vacuum. In addition to the "higher" one for the ported vacuum advance for the distributor.

One of the "large" ports is to be used for power brake vacuum hose (I would assume the rear since is is closest, then the other for pvc (the front).

The other small one in front next to the large one can be used for intake manifold vacuum for like vacuum operated HEVAC mode doors etc. If you don't need it, plug it with a vacuum cap.

I also see that it is a manual choke carburetor. I like the electric chokes myself. You may want to consider using an electric choke, they are easier to drive with - you don't have to keep adjusting it as it warms up....
 
Snake said:
I see that the port for the pvc hose is in the front and there is another port for power brakes in the rear can i use the rear for my pvc?
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Are you asking if you can use either large port for the PVC?


You should be able to use either one if you don't have power brake booster or run the booster off the intake manifold plug. They are both "plumbed" from the baseplate, therefore should both have the same exact vacuum signal (intake manifold vacuum).
 
krazykuda said:
Are you asking if you can use either large port for the PVC?


You should be able to use either one if you don't have power brake booster or run the booster off the intake manifold plug. They are both "plumbed" from the baseplate, therefore should both have the same exact vacuum signal (intake manifold vacuum).
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Yessssssssssssss I am for some reason me thinks the front hose to run the pcv will be in the way,like fuel line.Iam kind of stoke never had a brand new carbbbbbbbbbbbbbbbbbb.
 
The off idle bog is real, I have the street avenger on my 340 duster. There is still play no matter how you adjust the arm on the accelerator pump. Other than that I can reach in the window and it will start right up and run it thru the rpm's just fine. The off idle stumble sucks tho. I've used vacuum gauge, double checked timing and it's the play in the arm on the avengers causing it. I can throw an edelbrock I have that I know works fine on it and it runs fine.

Not saying one is better than the other, just letting you know the issue I've ran into with the avenger.

Scott
 
sdcarsey said:
The off idle bog is real, I have the street avenger on my 340 duster. There is still play no matter how you adjust the arm on the accelerator pump. Other than that I can reach in the window and it will start right up and run it thru the rpm's just fine. The off idle stumble sucks tho. I've used vacuum gauge, double checked timing and it's the play in the arm on the avengers causing it. I can throw an edelbrock I have that I know works fine on it and it runs fine.

Not saying one is better than the other, just letting you know the issue I've ran into with the avenger.

Scott
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Did you try a different pump cam,shooter? it on the truck for delivery today.
 
I got the off idle stumble as well. Played and played w/it. Time to make a few mods to the pump cam arm.

[ame="http://www.youtube.com/watch?v=gXLrhE5tGMo"]street avenger holley bog problem explained! - YouTube[/ame]
 
snake,

I know a carb guy...when it gets warmer out...and maybe stop snowing ..i shall ask him. the above vid was the one I was talking about earlier. I am now curious.

Ian.
 
Well the carb is in my hands,I cant see what that guy in the vid is talking about on my 670, pump arm is on the cam with no spring in its way and you can move the throttle and the arm moves,i see no issue time will tell.
 

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Thanks snake...cannot get to mine until I push the car back into the garage. Howver, I am still going to talk to my carb guy.

ian.
 
THIS is from the back side.
 

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I have the 570 and have no off idle stumble. Did have to make some adjustments though, not a bolt and go. Also I used the rear large vac port for my PCV.
 
Off idle stumble, the first thing to do is to check the clearance of the accelerator pump linkage (.015").

Also make sure that you have your timing right. Can't tune a carb if your timing is off.


Here's a link to the Holley tech site with videos on how to tune your carburetor:

http://holleytv.com/?cat=13
 
krazykuda said:
Off idle stumble, the first thing to do is to check the clearance of the accelerator pump linkage (.015").

Also make sure that you have your timing right. Can't tune a carb if your timing is off.


Here's a link to the Holley tech site with videos on how to tune your carburetor:

http://holleytv.com/?cat=13
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Timing is spot on and the clearance is .15 .
 
Snake said:
Timing is spot on and the clearance is .15 .
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I hope you mean clearance is .015".

Ok, then off idle stumble, you have to notice if it bogs right away, or comes on and then bogs.


If it comes on and then bogs, you need a smaller squirter.

If it bogs right off, then install larger squirter, or increase cam.
 
hey snake...bought a 670 last year to replace the original thermoquad on a mildly built 360.
The TQ worked well but with the alum. intake I wanted an electric choke. I've never had a holley before (I have used TQ's and AFB's) but anyway it worked well right OOTB with a minor secondary float adjustment and maybe an eighth of a turn on the idle mixtures to tweak it. I used the factory secondary spring ( I have a 4500 lb truck - 355's)

it starts right up on fast idle , and runs well with no bog or hesitation at WOT

anyway I do miss the spreadbore carb and I think I may try a 750 street demon this summer as comparison

later, jim
 
lil red said:
hey snake...bought a 670 last year to replace the original thermoquad on a mildly built 360.
The TQ worked well but with the alum. intake I wanted an electric choke. I've never had a holley before (I have used TQ's and AFB's) but anyway it worked well right OOTB with a minor secondary float adjustment and maybe an eighth of a turn on the idle mixtures to tweak it. I used the factory secondary spring ( I have a 4500 lb truck - 355's)

it starts right up on fast idle , and runs well with no bog or hesitation at WOT

anyway I do miss the spreadbore carb and I think I may try a 750 street demon this summer as comparison

later, jim
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Thanks jim thats the news i want to here,trust me I dont expect it to be right on, i have all ready change the secondary spring to the light yellow,and than a jet change from 65 to 69 is next and than my 4.5 power valve,my cam has low vacume.Ihave had a flat befor so that i am sure i can work that out,when you get some wing wang on you tube it cause doubt.
 
I never had to mess w/the 2ndaries but had to jet up the primaries from 68 to 72 to stop the surging at cruising speeds. Still need to mess w/the off idle stumble.
 
Snake, this is copied from my project thread:

The sun was up and the road around where I live was dry, so today I could give it a testdrive with the new Holley 670 Street Avenger. I have not done a thing to it besides setting the idle yet. I was really impressed with it though. I ran very good, clearly an upgrade from the Edelbrock 600 I had on earlier. I could however feel/hear the seconds kicking in so Im gonna swap to a softer spring there later on and give everything a good tune up as soon as spring is here. Im psyched!
 
trebor75 said:
Snake, this is copied from my project thread:

The sun was up and the road around where I live was dry, so today I could give it a testdrive with the new Holley 670 Street Avenger. I have not done a thing to it besides setting the idle yet. I was really impressed with it though. I ran very good, clearly an upgrade from the Edelbrock 600 I had on earlier. I could however feel/hear the seconds kicking in so Im gonna swap to a softer spring there later on and give everything a good tune up as soon as spring is here. Im psyched!
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SSSSSSSSSSSSSweet,put the yellow spring it will open faster :burnout::burnout:
 
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