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sr-71 headed 521ci carb and intake choice

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rmcomprandy
maverick172
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Post  maverick172 November 4th 2022, 10:40 am

i am putting together a sr-71 521 all forged bottom end compression will be around 10.4 with the combo i have
would like to know what i should run for a carb and intake would you guys use the trick flow mafia or the victor ?
also should i go 4150 carb or a 4500 dominator and 950cfm to small ?or go 1150cfm?
thanks Brad

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Post  rmcomprandy November 4th 2022, 11:07 am

maverick172 wrote:i am putting together a sr-71 521 all forged bottom end compression will be around 10.4 with the combo i have
would like to know what i should run for a carb and intake would you guys use the trick flow mafia or the victor ?
also should i go 4150 carb or a 4500 dominator and 950cfm to small ?or go 1150cfm?
thanks Brad

How and where will this engine be used for 80% of the time...?

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Post  maverick172 November 4th 2022, 11:09 am

rmcomprandy wrote:
maverick172 wrote:i am putting together a sr-71 521 all forged bottom end compression will be around 10.4 with the combo i have
would like to know what i should run for a carb and intake would you guys use the trick flow mafia or the victor ?
also should i go 4150 carb or a 4500 dominator and 950cfm to small ?or go 1150cfm?
thanks Brad

How and where will this engine be used for 80% of the time...?
i will be using it on street 80% time but i do drive it hard .
20% track time

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Post  rmcomprandy November 4th 2022, 12:58 pm

Personally, I would use a ported, (not just port-matched), Victor for that application.

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Post  supervel45 November 5th 2022, 1:25 am

I would go with at least a 1050 Dominator.

Here is another intake option if they have any.

https://cnc-motorsports.com/eliminator-big-block-ford-460-cj-v-intake-manifold-fits-cj-heads.html

https://www.alkydigger.net/product/ELIM-CJ.html

I don't know if 738drvr got to try one on his SR-71 deal or not.

https://www.429-460.com/t28498-new-cj-intake

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Post  maverick172 November 5th 2022, 7:22 am

rmcomprandy wrote:Personally, I would use a ported, (not just port-matched), Victor for that application.
how about the carb? dominator or 4150 ? 75% street 25% track

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Post  maverick172 November 5th 2022, 7:28 am

supervel45 wrote:I would go with at least a 1050 Dominator.

Here is another intake option if they have any.

https://cnc-motorsports.com/eliminator-big-block-ford-460-cj-v-intake-manifold-fits-cj-heads.html

https://www.alkydigger.net/product/ELIM-CJ.html

I don't know if 738drvr got to try one on his SR-71 deal or not.

https://www.429-460.com/t28498-new-cj-intake
looks like a nice intake who knows how it performs but..

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Post  Dave De November 5th 2022, 7:25 pm

A pump gas 521 with SR-71's is rather overkill but if you ever want to step it up you've got the heads. Assuming that hood clearance isnt an issue and its going to only rev to 6,500 or 7,000 Randy is correct that the Victor is best. You will gain more mid-range torque over the Mafia and below 7,000. The Victor will probably outperform the Mafia intake thru-out. Also realize that these SR-71 packages are tall where the intake is spaced up .800" and the Mafia is another .75" taller over the Victor. My tube chassis 69 should be similar to your Maverick it has a 6" outlaw hood and I dont have space for a carb spacer (SR's with a Mafia).

Suggest that you go 13.5 compression and use E-85. The engine will be happier and clean burning not to mention that the mid-range power will be way up.
Dominators on the street are okay just set the secondaries to be progressive. 1050 to 1250 is best.
Dave De
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Post  supervel45 November 5th 2022, 9:14 pm

Maverick is you order set in stone already?

If not there's what Dave said above about the E-85 and Mahle has P51/SR-71 Flat Tops for that.

With the bigish roller cam 272/280 you went with you could have gotten your 11/1 with 22cc Icons and 70cc chambers. They have the SVO/SCJ valve notches.

https://www.summitracing.com/parts/uem-ic861-030

If you enter in the shaved heads and 64cc chambers with the 22cc pistons you can get in the 11.9/1 range.

Just saying, if your order is not concrete yet.

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Post  maverick172 November 5th 2022, 10:01 pm

Yes I have it all ordered already.
Ya I cannot run e85 as we do not have that in Canada
Hence why I had to keep compression down and I did not want to go over 11 .. I think it will be ok .. was hoping to get 750 hp out of this combo what you guys think?

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Post  supervel45 November 6th 2022, 12:28 am

maverick172 wrote:Yes I have it all ordered already.
Ya I cannot run e85 as we do not have that in Canada
Hence why I had to keep compression down and I did not want to go over 11 .. I think it will be ok .. was hoping to get 750 hp out of this combo what you guys think?

^I say that's pretty close.

Check out the dyno numbers of this build with a 950 and a 1,200 Dominator. That's why I said at least a 1050.

https://www.yellowbullet.com/threads/528-pump-gas-ford-843hp-on-91.580279/

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Post  maverick172 November 6th 2022, 8:45 am

supervel45 wrote:
maverick172 wrote:Yes I have it all ordered already.
Ya I cannot run e85 as we do not have that in Canada
Hence why I had to keep compression down and I did not want to go over 11 .. I think it will be ok .. was hoping to get 750 hp out of this combo what you guys think?

^I say that's pretty close.

Check out the dyno numbers of this build with a 950 and a 1,200 Dominator. That's why I said at least a 1050.

https://www.yellowbullet.com/threads/528-pump-gas-ford-843hp-on-91.580279/
wow impressive 40 hp dif bewtween the carbs . i can get a brand new 1150 dominator for 1000$ a guy has one for sale prob will scoop it up .
is there much in setting up these carbs ?

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Post  Lem Evans November 6th 2022, 10:59 am

maverick172 wrote:
supervel45 wrote:
maverick172 wrote:Yes I have it all ordered already.
Ya I cannot run e85 as we do not have that in Canada
Hence why I had to keep compression down and I did not want to go over 11 .. I think it will be ok .. was hoping to get 750 hp out of this combo what you guys think?

^I say that's pretty close.

Check out the dyno numbers of this build with a 950 and a 1,200 Dominator. That's why I said at least a 1050.

https://www.yellowbullet.com/threads/528-pump-gas-ford-843hp-on-91.580279/
wow impressive 40 hp dif bewtween the carbs . i can get a brand new 1150 dominator for 1000$ a guy has one for sale prob will scoop it up .
is there much in setting up these carbs ?

If you run a Dominator, in your application, get a 1050 2 circuit with power valve[s].

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Post  maverick172 November 6th 2022, 11:38 am

Sounds good . What about a 4150 carb which one would you go with?

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Post  Lem Evans November 6th 2022, 12:51 pm

I don't know about now but, a few years ago the 950 QFT did a good job.

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Post  maverick172 November 6th 2022, 1:04 pm

I will try do a bit more research on carb choice

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Post  supervel45 November 6th 2022, 1:47 pm

Not all 950's are 950cfm. The HP950 List# 80496 is more like 840cfm. It's a 750 body with a 850 baseplate basically.
Like Lem said 2 circuit 1050 with power valves for the mixed use driving.

Holley 8082 fits this criteria and the 8082-1 shows 2 PV's. I'd block off the rear one and jet up.

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Post  supervel45 November 6th 2022, 4:40 pm

Here's a good video, curtesy of Tunner, on Dominator carburetor's.

https://www.youtube.com/watch?app=desktop&v=JW21G0o1bdk

If you want tuning info this place is the best for a website format I have found.

http://www.racingfuelsystems.com/viewforum.php?f=5

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Post  maverick172 November 6th 2022, 5:35 pm

supervel45 wrote:Here's a good video, curtesy of Tunner, on Dominator carburetor's.

https://www.youtube.com/watch?app=desktop&v=JW21G0o1bdk

If you want tuning info this place is the best for a website format I have found.

http://www.racingfuelsystems.com/viewforum.php?f=5
thank you for the help guys . i will do some more research and let you know.

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Post  maverick172 November 6th 2022, 6:45 pm

maverick172 wrote:
supervel45 wrote:Here's a good video, curtesy of Tunner, on Dominator carburetor's.

https://www.youtube.com/watch?app=desktop&v=JW21G0o1bdk

If you want tuning info this place is the best for a website format I have found.

http://www.racingfuelsystems.com/viewforum.php?f=5
thank you for the help guys . i will  do some more research and let you know.
so how about these quick fuel or pro form carbs ? are they 2 ciruit or 3 circuit they do not seem to list what they are . from what i have read 2 circuit much easier to tune .
thanks Brad

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Post  supervel45 November 6th 2022, 6:47 pm

Below is an old thread. Still a lot of good info. JMark is bigtime now and won the CMC shootout with his Dominator on a small block a few years ago, and that is his website in the previous link. Tunner, JMark and Yetti know the scoop on these Holley's and the other carburetors as well.

https://www.speed-talk.com/forum/viewtopic.php?f=1&t=9934

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Post  supervel45 November 6th 2022, 6:49 pm

maverick172 wrote:
maverick172 wrote:
supervel45 wrote:Here's a good video, curtesy of Tunner, on Dominator carburetor's.

https://www.youtube.com/watch?app=desktop&v=JW21G0o1bdk

If you want tuning info this place is the best for a website format I have found.

http://www.racingfuelsystems.com/viewforum.php?f=5
thank you for the help guys . i will  do some more research and let you know.
so how about these quick fuel or pro form carbs ? are they 2 ciruit or 3 circuit they do not seem to list what they are . from what i have read 2 circuit much easier to tune .
thanks Brad

I would stay away from Proform, and stay with a 2 circuit.

Here is an older Quick Fuel Catalog. It shows witch one are 2 and 3 circuit models.

https://images.carid.com/quick-fuel-technology/info/qft-catalog.pdf

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Post  Mark Miller November 7th 2022, 12:08 am

Dave De wrote:A pump gas 521 with SR-71's is rather overkill but if you ever want to step it up you've got the heads. Assuming that hood clearance isnt an issue and its going to only rev to 6,500 or 7,000 Randy is correct that the Victor is best. You will gain more mid-range torque over the Mafia and below 7,000. The Victor will probably outperform the Mafia intake thru-out. Also realize that these SR-71 packages are tall where the intake is spaced up .800" and the Mafia is another .75" taller over the Victor. My tube chassis 69 should be similar to your Maverick it has a 6" outlaw hood and I dont have space for a carb spacer (SR's with a Mafia).

Suggest that you go 13.5 compression and use E-85. The engine will be happier and clean burning not to mention that the mid-range power will be way up.
Dominators on the street are okay just set the secondaries to be progressive. 1050 to 1250 is best.

Medium or Moderate Progressive on the Secondaries for street use on the Dominator?

Mark Miller

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Post  Dave De November 7th 2022, 12:41 am

Mark Miller wrote:
Dave De wrote:A pump gas 521 with SR-71's is rather overkill but if you ever want to step it up you've got the heads. Assuming that hood clearance isnt an issue and its going to only rev to 6,500 or 7,000 Randy is correct that the Victor is best. You will gain more mid-range torque over the Mafia and below 7,000. The Victor will probably outperform the Mafia intake thru-out. Also realize that these SR-71 packages are tall where the intake is spaced up .800" and the Mafia is another .75" taller over the Victor. My tube chassis 69 should be similar to your Maverick it has a 6" outlaw hood and I dont have space for a carb spacer (SR's with a Mafia).

Suggest that you go 13.5 compression and use E-85. The engine will be happier and clean burning not to mention that the mid-range power will be way up.
Dominators on the street are okay just set the secondaries to be progressive. 1050 to 1250 is best.

Medium or Moderate Progressive on the Secondaries for street use on the Dominator?  

Just set it up so that they are not 1 to 1. The second setting will allow better feel on the secondaries even though they will come in sooner. In most cases on the street you cant use the secondaries anyway.
Dave De
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Post  Mark Miller November 7th 2022, 2:53 am

Dave De wrote:
Mark Miller wrote:
Dave De wrote:A pump gas 521 with SR-71's is rather overkill but if you ever want to step it up you've got the heads. Assuming that hood clearance isnt an issue and its going to only rev to 6,500 or 7,000 Randy is correct that the Victor is best. You will gain more mid-range torque over the Mafia and below 7,000. The Victor will probably outperform the Mafia intake thru-out. Also realize that these SR-71 packages are tall where the intake is spaced up .800" and the Mafia is another .75" taller over the Victor. My tube chassis 69 should be similar to your Maverick it has a 6" outlaw hood and I dont have space for a carb spacer (SR's with a Mafia).

Suggest that you go 13.5 compression and use E-85. The engine will be happier and clean burning not to mention that the mid-range power will be way up.
Dominators on the street are okay just set the secondaries to be progressive. 1050 to 1250 is best.

Medium or Moderate Progressive on the Secondaries for street use on the Dominator?  

Just set it up so that they are not 1 to 1. The second setting will allow better feel on the secondaries even though they will come in sooner. In most cases on the street you cant use the secondaries anyway.

Thanks right now it looks like i'm at the Moderate Progressive Set Up Black Rod Hole #3 on my Quick Fuel QFX-4700 1050 Dominator!!

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