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Carb choice for Street-Strip 512

JackpotJim

JackpotJim

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My 512 low deck stroker build is progressing and all I have left to purchase is a carb and headers. The person I worked with that helped me with a cam choice recommended a 1050 cfm carb. The motor is a flat top piston 11.5 to 1 with TF 270's, cam is 260,264 duration, 656, 662 lift. Transmission is a TCI manual shift 727 with brake, 4.10 rear gear. 28 inch rear tire. I have a couple choices on a torque converter. I have a 4500 9.5 inch and a 3500 11 inch, both are street strip style converters and I'm thinking I'll go with the 3500 to catch some of the massive torque this motor should make between 3 and 4000 rpm. The carb choices I'm looking at are a Gen 3 Holley Dominator 80902BK or a QF Brawler 67209 race carb. Both are 1050 cfm, the QF is a 4150 style carb and of course the Holley is a dominator. Since both flow the same amount of air and gas does one style carb fit my build better then the other? I've never owned or used a Dominator and don't know much about them. This motor is going in my 66 B body that weights 3800 lbs and I drive the car a few 1000 miles during the warm summer months in Minnesota. Any input is welcome, my end result is hopefully a low 11, high 10 second street-strip car that doesn't require 10 hours of maintenance every week. Thank you
 
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I run the Speed Demon on my 505. It's a great street/strip carb that has given zero issues and runs hard.
 
I think a dominator is to much carb. I think looking at 850 or maybe a bit bigger. Sounds like you want the whole package like we all do. Cruise on the weekend and knock down 11s at the track and.drive home again. No matter what you go with its going to take some tuning , going to hve to find that happy medium between driving and all out race. The domintor was not ment to be a cruiser ....
 
Canadian1968 said:
I think a dominator is to much carb. I think looking at 850 or maybe a bit bigger. Sounds like you want the whole package like we all do. Cruise on the weekend and knock down 11s at the track and.drive home again. No matter what you go with its going to take some tuning , going to hve to find that happy medium between driving and all out race. The domintor was not ment to be a cruiser ....
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That's what we do. Has run 11.1's on motor, 10.3's on a whiff of spray and I can drive this thing anywhere on pump gas through the mufflers and pull down 11mpg. The damn thing runs like it is fuel injected.
 
i run a 1050 Holley 4500 on my 505 , daily driver plus bracket racer .
At this point im not sure fuel economy is the answer , you are running 505ci . It is the Holley SP aluminium unit , and yes i have done some changes . Unless you run a custom billet carb you will probably not get the same air flow as a 4500 , 1 has 1-3/4"butterflys the other 2"
Also it seems with the max wedge port you only get 4500 manifold unless you use an adapter (?) .
as to converter put the bigger one in , it will drive better and be quicker . Again i have a 8"6000 stall .

Tex
PS : if i was to think of milage , maybe 8-9mpg in town ,10-11 highway
 
Dodge 330 said:
That's what we do. Has run 11.1's on motor, 10.3's on a whiff of spray and I can drive this thing anywhere on pump gas through the mufflers and pull down 11mpg. The damn thing runs like it is fuel injected.
Click to expand...

Exactly, well tuned and proper size (only 850) but I'm sure it took some tuning to get it there !
 
Canadian1968 said:
Exactly, well tuned and proper size (only 850) but I'm sure it took some tuning to get it there !
Click to expand...
I have a recurved stock style distibutor that I worked over but, to be honest, the carb is right out of the box save for setting the idle/air mixture screws. No flat spots, starts instantly and does everything I want. I planned on fuel injection for this engine until I tried this carb. No need. One of the best carbs I have owned.
 
my 500" stroker is sort of like that, a bit more compression and cam. I am using my old Indy 400-2 (4150) single plane intake, and have used the Holley HP 950. It is good for street strip, but I feed the car could use more cfm. I did run a QF 1050 E-85 carb, and it ran good until the E-85 ate my fuel filter (I guess the Mallory 500 filter was not designed for the alcohol.) I had a FiTech 1200 PA sitting on the shelf, so I put it on. I'm pretty sure the lower cfm will hurt max HP, but the EFI made the car way more drivable and fun on the street. If you want the most out of the engine, the Dominator would be my choice. It gives room to grow in the future too.
Really on my "B" low deck stroker, the Indy tunnel ram with dual carbs (or EFI) would be nice, but won't fit under my hood.
 
JackpotJim said:
My 512 low deck stroker build is progressing and all I have left to purchase is a carb and headers. The person I worked with that helped me with a cam choice recommended a 1050 cfm carb. The motor is a flat top piston 11.5 to 1 with TF 270's, cam is 260,264 duration, 656, 662 lift. Transmission is a TCI manual shift 727 with brake, 4.10 rear gear. 28 inch rear tire. I have a couple choices on a torque converter. I have a 4500 9.5 inch and a 3500 11 inch, both are street strip style converters and I'm thinking I'll go with the 3500 to catch some of the massive torque this motor should make between 3 and 4000 rpm. The carb choices I'm looking at are a Gen 3 Holley Dominator 80902BK or a QF Brawler 67209 race carb. Both are 1050 cfm, the QF is a 4150 style carb and of course the Holley is a dominator. Since both flow the same amount of air and gas does one style carb fit my build better then the other? I've never owned or used a Dominator and don't know much about them. This motor is going in my 66 B body that weights 3800 lbs and I drive the car a few 1000 miles during the warm summer months in Minnesota. Any input is welcome, my end result is hopefully a low 11, high 10 second street-strip car that doesn't require 10 hours of maintenance every week. Thank you
Click to expand...
Talk to Dom, he knows carbs, if you dont have FB he is on Moparts, Thumper Carbs https://www.facebook.com/thumpercarbs.thumper/
 
In my humble opinion a hi compression big stroker with a nice big cam and great heads is BEGGING for a dominator, and maybe bigger than a 1050. Ask Dom, take his advice, he's good!
 
We run a 10:1cr 589ci street wedge motor with -13 365CNC heads, a small s/roller .625">260/[email protected] and a 950HP with 1.375 v and a 1.750 billet base plate, prob not even 850cfm, it pulled 2hg@6000 rpm and made near 700hp on the dyno with 720ftlbs@4400, good street/strip carb I have to admit, we drive on the street, to shows and to the race track and race through full exhausts, for next year we have a Thumper 1050-ish BLP billet Dom to try on our mild motor, we run a 440-2 intake and have a 2" 4 hole HVH sucker adapter, I think its worth a 10th or so and some mph, a Dom was actually tried on Dyno day and it made slightly less power which is surprising but we don't know how good it was or if any tuning was done on it, prob not. We run a 4200 stall verter, its a bit tight for the track. I would 100% go for the 4500 with your combo.
 
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as a side note . I also ran stock size port heads , CNC stealth , on my 505 . Before the 270s . I ran this with a HP1000(850) Prosystems carb , Victor intake . Best run was 10.50 , probably averaged 10.58/60 over the year . Took me a lot of work to get the carb right . Probably had 1/2mpg better .

Tex
 
you guys need to read some of @68 HEMI GTS
threads, he's done it well, with Dominator

nothing on that style build is going to be a bolt out of the box

I've had 1450/950 based that flowed 1100cfm
it can be done, not that tough
knife-edged blades, countersunk screws, polished throats etc.
if you want a little crisper throttle response with the smaller bore carb
IMFO that's the only real difference, advantage if any,
from using a tricked-up/out 1450 style ported/flowed carb on an engine with;
huge head flow, huge ports & big cam, bigger cubes
you'll spend just as much as a Dominator in the long run
& IMHO it will never flow as good

you will need to finetune, whatever carb you pick

I think I'd go with a professional carb builder,
unless you know what you're doing, well versed on mods
If it were mine
I'd go with a Dominator, properly sorted out too
done it before, drove my full-on racecar on the street
with a single, duals & split dominators
it can be done

no replacement for flow
much like the heads

as long as the bottom end, is right, the heads & valvetrain are right

just my Opinion

if it going to be more of a street car, than a dedicated strip car
& you don't need every 10th of a second out of it
go with the tighter converter

good luck
 
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