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New Holley Street Avenger Carb Question #2576763
11/10/18 01:43 PM
11/10/18 01:43 PM
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USA
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440mopar Offline OP
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440mopar  Offline OP
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I'm considering purchasing a new Holley 670 Street Avenger carb. I see Summit has this carb. in part number 80670 and 83670. Doing a side-by-side comparison it looks as though they are they same with the exception that the 83670 is aluminum. However, the aluminum version is $26 cheaper. I would have that the aluminum would have cost more. Does anyone have any experience with these carbs. and if so, is an aluminum carb. a pro or con?

Re: New Holley Street Avenger Carb Question [Re: 440mopar] #2576852
11/10/18 07:33 PM
11/10/18 07:33 PM
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The Great White North
RAMM Offline
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I have never and I mean NEVER seen one of those carbs run correctly. Avoid. J.Rob


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Re: New Holley Street Avenger Carb Question [Re: RAMM] #2576882
11/10/18 08:52 PM
11/10/18 08:52 PM
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Detroit area
6PAX Offline
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Originally Posted By RAMM
I have never and I mean NEVER seen one of those carbs run correctly. Avoid. J.Rob


Are you referring to just the 670 version or any Street Avenger carb.? I have had a 770 Street Avenger on my car for nine years and it has run perfectly from day one.

Re: New Holley Street Avenger Carb Question [Re: 6PAX] #2577049
11/11/18 10:49 AM
11/11/18 10:49 AM
Joined: Feb 2006
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The Great White North
RAMM Offline
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Originally Posted By 6PAX
Originally Posted By RAMM
I have never and I mean NEVER seen one of those carbs run correctly. Avoid. J.Rob


Are you referring to just the 670 version or any Street Avenger carb.? I have had a 770 Street Avenger on my car for nine years and it has run perfectly from day one.


I hope you buy lottery tickets because I have never seen ANY Avenger series carb run properly. In fact I have had many come in for dyno testing and we cannot even perform one safe pull. You can play with jetting all day and it won't make a difference. Something is messed up with the metering blocks and I have never looked into as time is $$$. J.Rob

p.s. I bet if you put a regular and known good double pumper on you would see what you have been missing out on.


2009 PHR\EMC Competitor
2010 PHR\EMC Competitor
2011 PHR\EMC Competitor
2012 PHR\EMC Competitor
2013 PHR\EMC Competitor
2014 HotRod/EMC Competitor
2015 HotRod/EMC NoShow
2016 HotRod/EMC 3rd place SPEC Bigblock
2018 HotRod/EMC 7th place G3
Re: New Holley Street Avenger Carb Question [Re: RAMM] #2577062
11/11/18 12:16 PM
11/11/18 12:16 PM
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Detroit area
6PAX Offline
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Originally Posted By RAMM
Originally Posted By 6PAX
Originally Posted By RAMM
I have never and I mean NEVER seen one of those carbs run correctly. Avoid. J.Rob


Are you referring to just the 670 version or any Street Avenger carb.? I have had a 770 Street Avenger on my car for nine years and it has run perfectly from day one.


I hope you buy lottery tickets because I have never seen ANY Avenger series carb run properly. In fact I have had many come in for dyno testing and we cannot even perform one safe pull. You can play with jetting all day and it won't make a difference. Something is messed up with the metering blocks and I have never looked into as time is $$$. J.Rob

p.s. I bet if you put a regular and known good double pumper on you would see what you have been missing out on.



No reason to change carbs as I'm not missing out on anything. I couldn't expect the car to run any better than it does. I also know someone running an 870 Avenger on their car and it's the same thing, no issues at all right out of the box. And yes, I do buy lottery tickets. No luck so far.

Re: New Holley Street Avenger Carb Question [Re: 440mopar] #2577072
11/11/18 12:54 PM
11/11/18 12:54 PM
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Aurora, Colorado
451Mopar Offline
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The Idle restriction and power valve restrictions in the metering blocks are smaller/leaner than most carbs. Mine would go lean in the transition range until I opened up the idle restriction.

Re: New Holley Street Avenger Carb Question [Re: RAMM] #2577126
11/11/18 02:54 PM
11/11/18 02:54 PM
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Sobieski Wi
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bee1971 Offline
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Originally Posted By RAMM
Originally Posted By 6PAX
Originally Posted By RAMM
I have never and I mean NEVER seen one of those carbs run correctly. Avoid. J.Rob


Are you referring to just the 670 version or any Street Avenger carb.? I have had a 770 Street Avenger on my car for nine years and it has run perfectly from day one.


I hope you buy lottery tickets because I have never seen ANY Avenger series carb run properly. In fact I have had many come in for dyno testing and we cannot even perform one safe pull. You can play with jetting all day and it won't make a difference. Something is messed up with the metering blocks and I have never looked into as time is $$$. J.Rob

p.s. I bet if you put a regular and known good double pumper on you would see what you have been missing out on.


Sounds exactly like the issues with the Edelbrock 1407/1411 carbs

Why waste your time playing with those two carbs when there are so many better options out
there


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Re: New Holley Street Avenger Carb Question [Re: 440mopar] #2577523
11/12/18 03:53 PM
11/12/18 03:53 PM
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tucson az
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frank Offline
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tucson az
I ran the 670 SA on a mild 383 in my Charger for years. Bought it brand new in about 2008. Car ran OK but always had a part throttle surge and slight hesitation problem. Could never get rid of either one. Car was in storage for a few years so I ordered a rebuild kit to freshen up the carb. Now it won't run at all. Put my old Eddy competition series 750 on the car and runs fine. I like Holley but I would not get another Street Avenger. Frank

Re: New Holley Street Avenger Carb Question [Re: frank] #2580275
11/19/18 05:31 PM
11/19/18 05:31 PM
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dogdays Offline
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In a carb test run by Dunnuck a couple of years ago, the 670 Street Avenger was the farthest off and the most difficult to tune of the carbs they tested. The best was the Holley Street Demon. Nearly perfect out of the box, IIRC. For some reason the 670 is the red headed stepchild of the Street Avenger series. My 570 was up 2mpg over the Holley 1850 that had been jetted down for altitude. It was a really good carb.

The Street Demon with the space age plastic bowl is reminiscent of a Thermoquad, and is probably the latest design you can find. It will bolt on your square bore intake with no adapter. They don't cost too much, either.

R.

Re: New Holley Street Avenger Carb Question [Re: 440mopar] #2580279
11/19/18 05:38 PM
11/19/18 05:38 PM
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So Cal
Sinitro Offline
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So Cal
IMHO...
There is no such thing as a perfect carburetor...
Every engine is different (compression, intake manifold, cam specs) and it takes patience and experience to dial the carburetor in. A Holley is very simple to tune, its just isolating the problem area and then making the appropriate tweaks...

To me the basic problem today is that there are fewer & fewer experienced guys with carburetor experience..

Just my $0.02... wink

Re: New Holley Street Avenger Carb Question [Re: 440mopar] #2580315
11/19/18 08:04 PM
11/19/18 08:04 PM
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CT
GTX MATT Offline
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I had a 770 SA on a 440 that pulled only about 7 inches of vacuum at 1000 RPM. Straight leg boosters and all, the fuel curve actually worked well, better than alot of other Holleys. Needed to be a little extra rich for best power at WOT (11.8ish), but the car ran decent.


Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
Re: New Holley Street Avenger Carb Question [Re: Sinitro] #2580323
11/19/18 08:30 PM
11/19/18 08:30 PM
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Posts: 19,317
State of confusion
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Thumperdart Offline
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Originally Posted By Sinitro
IMHO...
There is no such thing as a perfect carburetor...
Every engine is different (compression, intake manifold, cam specs) and it takes patience and experience to dial the carburetor in. A Holley is very simple to tune, its just isolating the problem area and then making the appropriate tweaks...

To me the basic problem today is that there are fewer & fewer experienced guys with carburetor experience..

Just my $0.02... wink


So true........ beer


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Re: New Holley Street Avenger Carb Question [Re: dogdays] #2580331
11/19/18 08:53 PM
11/19/18 08:53 PM
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Benton, IL.
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DaveRS23 Online rolleyes
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Originally Posted By dogdays
In a carb test run by Dunnuck a couple of years ago, the 670 Street Avenger was the farthest off and the most difficult to tune of the carbs they tested. The best was the Holley Street Demon. Nearly perfect out of the box, IIRC. For some reason the 670 is the red headed stepchild of the Street Avenger series. My 570 was up 2mpg over the Holley 1850 that had been jetted down for altitude. It was a really good carb.

The Street Demon with the space age plastic bowl is reminiscent of a Thermoquad, and is probably the latest design you can find. It will bolt on your square bore intake with no adapter. They don't cost too much, either.

R.


iagree The Street Demon is the $hit. At least for street cars. Has worked very well on every street combo that I have installed one on so far.

Getting ready to put one on another 440 soon.


Master, again and still
Re: New Holley Street Avenger Carb Question [Re: 440mopar] #2587040
12/04/18 03:03 PM
12/04/18 03:03 PM
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Sac, CA
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mopowers Offline
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I had a 670 SA on my mild 340 for a minute. The idle circuit on it was waaaay lean. Sucks to have to drill holes in a brand new carb not built for that level of tuning.







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