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.

 

[Frank Mopar]

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.

594 starts the speed trap to 660. Some tracks log it, some don’t

 

[Some Car Guy]

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.

I saw the engine masters episode and immediately wondered if you could just throttle the engine with cam or intake choice if you couldn’t make good use of the extra power, but would have it on the table for later any time your situation changed. Seeing the torque stay the same on that test was memorizing.

His hood issue is a tough one. Could somebody like Wilson Frankenstein up an intake?

 

[7TBee]

I remember reading that the Trickflow “B” intake can be opened up to MW (270) size and might fit under the hood.