Carb size for 512 stroker

[TexasRoadRunner68]

Looking into getting a mighty demon 850 with annular boosters for my build. Looking at building a 400/512 with 10.5-11:1 compression, trick flow 240 heads, Holley street dominator intake and a 254/258 duration cam at 0.050 with .608lift on a 109 lsa.

Is this going to be properly sized, or should I be looking into a 950/1050?

 

[Aron Gleason]

If you're on Facebook look up Dominic thumper. Give him all the specs on your car and he can set you up with a carburetor that'll work well.

 

[rumblefish360]

Good idea with Dominick.
Otherwise I’d say a bigger carb. The 850 is small for a mill like that. It’ll be plenty streetable and fun but a loss up top.

 

[SlinktRR]

Are you going to dyno the engine? Most shops use a Holley double pumper 4150 like 850cfm as a dyno carb. Buy something bigger and bring it to the dyno and run them back to back. I use a 950 on something similar as what you have planned and it runs great, it ran fine with the shop 850 carb as well. Dominator is always an option but I like the 950 on the street just fine.

 

[sclee440]

I used a Quick Fuel BDQ-950 on my 511. Runs like a champ.

 

[33 IMP]

Engine masters did a test of a 4150 "1000" cfm against a 1050 dominator. Basically, a wash. I admit to being surprised.
I've got a m1 dominator intake, gonna run a 1050 on my 520.

 

[Geoff 2]

I use the mighty Demon for a door stop or boat anchor & use a mighty 850 Thermoquad.

 

[rumblefish360]

I use the mighty Demon for a door stop or boat anchor & use a mighty 850 Thermoquad.

Only if it’s well modified!

 

[68 HEMI GTS]

Engine masters did a test of a 4150 "1000" cfm against a 1050 dominator. Basically, a wash. I admit to being surprised.
I've got a m1 dominator intake, gonna run a 1050 on my 520.

m1 is a great intake. My buddy ported one and put it on his 10:1 440. We topped it with one of my home built 1050/4500’s. Car picked up 3 tenths and broke into the 11.20’s yesterday. Not bad for a b body street car that runs on pump gas. Left lane.

 

[TexasRoadRunner68]

m1 is a great intake. My buddy ported one and put it on his 10:1 440. We topped it with one of my home built 1050/4500’s. Car picked up 3 tenths and broke into the 11.20’s yesterday. Not bad for a b body street car that runs on pump gas. Left lane.
View attachment 1301887

After seeing the Engine masters where they put the TFS 240 vs the 270 on a basic 440 with 6 pack pistons it has me questioning going with 240s.

The 270s were better everywhere. But I know there are far less max wedge intakes for B motors. And I think all are high single planes that won’t clear a factory hood. So that likely means a fiberglass hood for a 70 charger.

 

[33 IMP]

I know I have asked this before, and gotten an answer, that I don't recall. Anybody know what's with the 594 foot clocks? The others all make sense.

 

[33 IMP]

m1 is a great intake. My buddy ported one and put it on his 10:1 440. We topped it with one of my home built 1050/4500’s. Car picked up 3 tenths and broke into the 11.20’s yesterday. Not bad for a b body street car that runs on pump gas. Left lane.
View attachment 1301887

Do you know what he had on it before, intake and carb?

 

[68 HEMI GTS]

Do you know what he had on it before, intake and carb?

We ran a pretty well dialed in six pack set up.

 

[68 HEMI GTS]

After seeing the Engine masters where they put the TFS 240 vs the 270 on a basic 440 with 6 pack pistons it has me questioning going with 240s.

The 270s were better everywhere. But I know there are far less max wedge intakes for B motors. And I think all are high single planes that won’t clear a factory hood. So that likely means a fiberglass hood for a 70 charger.

What’s size engine, your stuck with an Indy single plane or mod man on a low deck. Max effort 270’s are a no brainer. Street car that rarely sees the strip 240’s are a better route. Just depends on what you want to do. A 500 ci engine will handle 270’s with ease if the car has the right gear and converter.

 

[33 IMP]

We ran a pretty well dialed in six pack set up.

I've got a port matched team G single plane and an 850 dp, on my 440 now. I was wondering what the m1 might do. I don't think I have enough engine for it right now.

 

[68 HEMI GTS]

I've got a port matched team G single plane and an 850 dp, on my 440 now. I was wondering what the m1 might do. I don't think I have enough engine for it right now.

This is the car we put the M1 on. 10:1 440 with edelbrock heads, mild porting, and the biggest extreme energy street roller comp sells. 4.10 gear and a loose 10” vert. Hardly a race car.

 

[TexasRoadRunner68]

What’s size engine, your stuck with an Indy single plane or mod man on a low deck. Max effort 270’s are a no brainer. Street car that rarely sees the strip 240’s are a better route. Just depends on what you want to do. A 500 ci engine will handle 270’s with ease if the car has the right gear and converter.

512 cubic inches with ~10.4:1 compression. The car has the factory 3.54 gears, which might get swapped to 4.10s. If I go standard port, I have a street dominator intake that should clear the hood fine. I doubt any of the max wedge intakes clear. I’m not sure if any normal port intakes can be ported to max wedge size and clear. It’ll be a mainly street car, but I’d probably say I want to build it to where it’s plenty strip capable.