Carb Selection for a 512 Stroker

[Wookie316]

As the title says. I have an 870 Street Avenger and I am considering changing it out and I am curious to what people like out there? I was thinking an HP Holley, but I want to hear about Quick Fuel and Demon opinions too! Here is my build.
512 Stroker (400 block) 513 HP/608Ft/Lbs

MP 452 Aluminum head
Comp adjustable rockers
Comp hydraulic cam 1228 .545 lift 241 intake 247 exhaust
Performer RPM intake
Holley 870 Street Avenger Vac/sec
MSD distributor and 6AL-2 box
Callie's Dragonslayer crank 4.250, 2.750, 2.200
Scat H Beam 4340 Rod
Custom Diamond Piston .045
Power Bond Balancer
McLeod Flywheel
McLeod 6913-07 RST clutch
Tremec TKO600
8 3/4" 3.91

 

[mr. b]

I have a demon on my car and I love it works great and no problems

 

[MikeyT]

850 holley double pumper would be great on that engine!

 

[6speedGTX]

Just out of curiosity, are you having trouble with the street avenger? I've never had one but have heard lots of good stuff about them.

 

[Wookie316]

Just out of curiosity, are you having trouble with the street avenger? I've never had one but have heard lots of good stuff about them.

Honestly other than a rich idle and a bog once and awhile it's not horrible. Only reason I'm really kicking the idea around is because when I had the car dyno tuned the guys said there were much better carb options for the size of my build to really perk things up. They did mention a HP was a good option.
Perhaps I'm over thinking things?

 

[cryplydog]

what is the weight of your McLeod flywheel? I like the quick fuel carb.

 

[Wookie316]

what is the weight of your McLeod flywheel? I like the quick fuel carb.

464100 McLeod Flywheel. I believe they are 30 pounds?

 

[bigmanjbmopar]

I have the QFT 850 DP mech secondary's. 4 corner idle, bowl windows all 4 corners. OTB it fired up and ran great. Running it on my 440 / 493 seems to be plenty even though I was told I should be running a 950.

 

[Propwash]

Run a Quickfuel Q950 on my 512
632HP 696Ft/Lbs TQ

Great Carb. Easy to tune, Easy to modify
At Dyno, opened up the secondary high speed air bleeds (a lot-drilled them wider), went up two jet sizes on primary's.
Tuning at home, had to rich up primary idle bleed screws, lean the secondary's a tad and play with the primary and secondary idle speed screws as well. Added a Holley adjustable secondary link to tweak secondary engagement, instead of using 1 of the 3 different sized linkage rods. Works great!

1 hour of tuning with good results. Fun to play with.

Good luck

 

[splicer]

Holley 950 Street HP on a 505" stroker....set up with an air/fuel monitor and track/street driving

Everything is adjustable and it's a lot cheaper than a race HP.......mine has worked great for 2 seasons now..

Splicer

 

[lewtot184]

before you toss out that 870 you need to do a little research on venturi and throttle bore sizes on some of the mentioned carbs. don't get lost in cfm numbers; a lot are bogus. i think you'll find that you will be blowing money on something thats not any better and all you really need is a little tuning.

 

[HYRDGOON]

I bought the carb they dyno'd my 522 with Quickfuel 780

 

[Wookie316]

before you toss out that 870 you need to do a little research on venturi and throttle bore sizes on some of the mentioned carbs. don't get lost in cfm numbers; a lot are bogus. i think you'll find that you will be blowing money on something thats not any better and all you really need is a little tuning.

So what does a guy need to be looking for exactly and what would you recommend? I have heard the CFM thing before but don't quite understand what guys mean?
An avenger is about 1/2" the price of an HP so I assume it is because of design or something? I understand if tuning isn't right a guy is wasting his $.
Bought the avenger because I had it in my mind I needed electric choke. Now realizing I'm not winter or daily driving this thing my thoughts are maybe there is a better option for me? I may be thinking wrong though? Not sure?

Car is mostly street with the odd trip to the track come weekends.