i was thinking bout getting the holley street avenger but not sure if i should or not.. what other holley carb is close in comparison to it?? i thought bout speed demon but to pricey.. the only reason i thought bout the street avenger is because of the warranty and the out of the box ready to run with maybe a few minor adjustments.. what does everyone else think?? i will be putting it on a 406.. thanks

Just a regular Holley 750VS..they're about $245 in Jegs

The Demon is much more likely to be an out-of-the-box carb. Wish I would have gone that way instead of the Holley.

But, like Jester said, the regular electric choke 750VS (Jegs p/n 510-0-80508S) is a better choice than the Avenger. For kicks add a 4150 conversion kit (and 4150 dual-feed line), quick-change secondary spring kit & secondary spring assortment (or replace those two with an adjustable secondary diaphragm), and 66-99 jet assortment. You'll have a much more tune-able carb and still for less money than the Avenger.

what is the 4150 kit do??sorry to be so dumb on this subject i am new to carbs.. i would love to get a demon but i have seen lots of problems with them and never seen any problems with the holley brand i am sure there are but.. also i have seen that its harder to get parts for the demons verse the holley brand.. so i do want a carb with electric choke?? i only drive the car when its warm out does that mean i dont need a choke??

the 4150 kit puts a metering block in the secondaries, as opposed to a plate. Meaning it makes it adjustable.

Nice but run it for awhile first. I ran a 4160 awhile ago and found that the plate was close enough tunign wise and didn't need to be changed.

why VS and not mech.. secondaries?? just wondering

because you asked what was a close comparison to the SA 770. The Street Avengers are all vac secs.

ok let me refrase it.. should i go with VS or mech..??? what are the pros and cons of either like i said i am new to carbs so i dont wana mess anything up do u think i should go with a 650 or the 750 or if i do choose the street avenger the 770?? the guy who built my motor said it should be bout 375 hp.. i thank u guys for helping me out here. much appreciation..

IMO,

Vac secondary is much better for street cars. Easier operation, easier to get setup for the secondaries & better mileage.

Mech secondary....biatch to tune, harder on gas(depends on your foot but generally) and harder to set-up street-light stomping power.

I would stick with a VS unless you really want to start playin with accel pump cams, jets, squirter sizes ect....

What are your intentions for the car realistically?

i basically want 12's the way the car sits with vortec heads and i really dont think that is out of the question.. the motor is 375 hp... so i want what carb is best for the motor

If you can tune the double-pumper Holley, then go with it.

Your looking around the 750cfm line so go with a 750 dbl pumper & get at least a jet kit.

Then you'll be dreading screwing around with those accelerator pumps, squirter sizes & powervalves ect...

Good Luck.

so what can i do to get away from the accel pumps and squirter sizes then?? should i go witha douolbe pumper or just a regular 750 holley??

2ponchos,

Save yourself a big headach and just go with the S/A 770.
Yes you could get the same results with a 80508S and some conversion parts and it would be cheaper but just stick with some thing that you can pop on and go with. An extra $100 for a ready to run carb sounds like a great deal to me.

No carb is "street ready" out of the box....they will all require some sort of tuning. If you get one that is perfect right out then you got lucky. I agree, if you are not pinching pennies then get the SA 770. They are nice carbs and I like mine. I think its a PITA to get all of the stuff and put it together. Besides, a vacuum secondary carb is great for the street. The engine will pull what it needs when it needs it.

cool thanks SA 770 it is then thanks guys

I apologize for making it sound that easy. No carb is ready to go out of the box they all require tuning but I’ll take the 4 A/F screws that will need to be adjusted over pulling the fuel bowls and swaping jets any day. Although jet swaping is easy.


SSC

yeah i figured it would need some adjustments but it does sound like the easiet way to do it thanks again

I am running the SA 770 and right now I am running a little rich out of the box. I will need to step it down a Jet or two however I used a VAC gauge and set the Idle air..........set the idle........backed the choke off and its been perfect.......took about 10 min. I would buy it again. You can check my sig. you may not even need to step any jets just depends on application.



Brian

i am glad i stumbled on this topic because i was going to start a new thread. I am also putting a 406 in my bird, and am wondering on the carbs. I have a edelbrock 750 and a holley 750VS. I thought about a double pumper, but dont know. I have a friend who swears DP are better than VS, he says something about how much better the throttle response is with the DP. I know the DP has 50cc pumps in it too. His knowledge of cars and carbs is limited, and I havent really had any experience with DP's. I also thought about running a q-jet because of the small primarys and the coke can secondarys(and its cool when the secondarys kick in)but i dont know how they compare to holleys performance wise. And what about the secondarys on a VS carb? there isnt any adjustment is there? is that where the conversion kit comes it? So basically I am asking the same thing as 2ponchos. 750DP? 750VS? 750 edelbrock or a q jet?sorry i asked so many questions. thanks for any help, and 2 ponchos i didnt mean to intrude on your thread with my questions. thanks

Good call on the A/F screws vs. jets SSC!
I hope you didn't think I was calling you out or anything. I was trying to just say that all carbs (no matter whether Holley/Edelbrock or screws/jets) will need some sort of adjustment.

no problem liljay i did end up getting the SA770 putting it on hopefully today maybe get to fire the new motor up this week end hopefully!!! wish me luck that nothing goes wrong lol!!!

i think really the only time you need a double pumper is for racing,so you can get that instant power to all the cylinders,instead of having that delay in power to all of the engine.Maybe im wrong...dunno.