starbattles1: GUYS..... The street Avenger is an emissions approved carb. It has a leaned out transfer circuit. It needs small cam, high vacuum in the intake to pull gas from the under sized transfer slots. The only way to fix it is to put a metering block on it from an older model holley 600. And then put your #31 jets on it, and buy a #61 power valve. Anything else is a band aid. HOLLEY IS JUNK AND SHOULD BE ASHAMED FOR NOT MAKING IT CLEAR WHAT KIND OF MOTORS THIS POS AVENGER BELONGS ON. After people have spent all kinds of money on accelerator cams, and nozzles they end up junking it and buying an Edelbrock. BAD BUSINESS HOLLEY!!!
lynn simmons: just put a bigger discharge nozzle on my 770 that sets on a ford 460 works great now
lynn simmons: yep i have the same problem
Nikola Tesla: I have a 1969 Mach 1 with a 390fe What Holley would you advise? Thanks
Lennie Phister: easy fix! just bend the pump arm down onto the pump cam
Gaming with The Real DudzFryd: I'm done with Street Avenger carbs. They're throw away units. Works great for a few thousand miles but when it comes time to rebuild it's just not worth it. My 670 worked great till one day it suddenly just gave up after 9K miles. I still have it in my garage and it looks really pretty with brand new everything from not 1 but 2 rebuild kits but there was nothing I could do to fix it when I discovered a huge vacuum leak caused by a hidden crack in the carb main body. It was so bad I thought I'd sucked a valve in the motor. New ignition system didn't fix anything either. It was the carb, no question about it now and that was after replacing $125 worth of parts that probably didn't need to be replaced but I wanted to be absolutely sure it wasn't something else. Slapped my old Carter AFB back on and voila! carb problem's gone. No more vacuum leak and dumping fuel out the tailpipe. Wasted $70 on parts including new brass floats. Lesson here is, go with an Edelbrock or just switch to TBI.
CityOfCrime209: So wat kind of carb would u recommend?
Jeremy Thompson: I had the same issue with the arm riding on the spring on my 670 avenger. I had an old 600 holley laying around, and I pulled the arm off of it. It was different than the avenger arm..it swapped right on, and the arm now rests on the pump cam properly using the older arm
Chris Ross: i as well have a bad stumble issue as well sa 670
Brandon Bates: Your problem is a easy fix. You just have to know what and how to adjust to fix it.
Templar Knight: Off idle stumble? Did you change your pump shot? Try taking it up a stage or two. I have a 770 street avenger on a 393 stroker.
Ed Cady: Why don't you put fuel regulator on there. 4 pounds is plenty of pressure for that carburetor
Lanc Mac: Too bad you guys are having these problems.. If you want to get rid of these I will take them.
Thirdgen83: 'Sucks when you don't know what you're doing, huh? I've had 2 Street Avengers and both ran just fine.
IronChefNC: I cant wait to pull this POS crap carb off my car....and use it for target practice
ThunderHead289: its very strange. it is only the street avengers I have noticed. I believe this issue was corrected and this was only a small few thankfully!
KianJorry: The green cam doesnt look like its around far enough to run on the lever if its not sitting on the spring. Apart from these issues the carb seems decent enough but these problems should not exist to begin with just poor design
KianJorry: Ok your spot on with the ultra avenger issues. On my engine the thing ran rich out of the box so bad it was eye burning. Had to crack open the secondaries so the mixture screws worked. Yeah I have the of idle stumble your talking about. I looked at the pump cam and noticed exactly the issue your talking about where the lever is running on the spring. Whoever designed that should be flogged. I m thinking of narrowing the cam lever to miss the spring.....change to another cam from the green one..
ThunderHead289: there are so many possible issues!. the hp series of carbs are so much better its ridiculous!
frankenstang1973: Outstanding! Had a whole world of pain with my 670 SA on a 351c, took a lot of messing about to get it anywhere near right, going to check mine today to see if it's binding on the spring like yours. Did up the squirter size but obviously not the real answer. Did see on a forum some reference to the air passages in the base plate being poorly finished & partially blocked with casting flash. Glad so see it's not just mine giving problems!
Street Avenger Holley Bog Problem (when you dont know what you are talking about)5
out of 5