I've been reading through some of Holley's literature on the Street Avenger series carbs. I'm wondering if any other members might have experience with them. Are they really the cat's meow, or just another Holley with the same old Holley problems with just a new look? Opinions?
I sell an assload of these. We sold 250 of the 670 last year. I don't know a return to sale ratio, but warranty/problem calls have been way down compared to the other stuff. There still might be a couple of bad ones that get through, but I say go for it. I haven't used on personally, but I sold one to a friend. He is still a friend. Mike
Sold one to a friend and he still talks to ya. That's a good sign. They harp that its a "straight out of the box" type setup that should require minimum tuning to get you dialed in, but I've not known anyone who has used one.
They have it pretty well handled as far as a general tune. I just talked to a guy who has installed a few. Says they have stops in them so the 'carburetor illiterate' will not go too far on the settings. There is no such thing as a drop on and go carb. They all need minor adjustment... as long as you got the right CFM. If not, it will require major adjustment.
I bought a 670 years ago and it runs great. The only problem I had was the plastic sight plugs for the float went bad. They turned a foggy color then the outer part of the plug broke off. The remaining threaded part stayed in place so I didn't get a massive gas leak. At the time there was alot of street scuttlebut about the plugs breaking and it was something to watch for. I'm guessing Holley has changed the plastic material by now. I was going to send the broken plug in to Holley but never got around to it. I just replaced it with a metal one from an older Holley carb and that was that.
In the instructions now, they have actually included to not run the site plugs but only use them for tuning... They have included metal plugs with the carbs now.
I put a 570 electric choke on my ZZ4 engine last year.The only problem was that I couldn't get it to idle down with the electric choke enabled. I ended up backing off the adjustment for the primary butterflys and not using the electric choke. Idles at about 625, returns great mileage and still has a lot of steam. GM rates the engine horsepower with a 750 but I couldn't get any of mine to work well, way fat...it seems to like the smaller carb. Ran well with a 600 vac, secondary also. I tried the Holley web tech line but they never answered back so I gave up on them. Charlie
I have one on my sbc 350 in my 72 chevy pickup. It ran a little rich out of the box and the float height needed to be set but other wise its ran perfect. the motor is bored .60 over, 292 duration cam, headers, edelborck intake. gets around 10 to 12 mpg
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