Dominator Carb On A Dual Plane Manifold. How Much Is The Power Difference?

I put a dominator carburetor on a dual plane intake manifold. I dyno both with a 4150 and the dominator and I share the results.

406sbc
11.2compression
AFR 227 competition port heads 1121-ti
AFR dual plane intake 4812
Erson solid roller cam 260/270 .685/.685 108lsa
1050 Holley sportsman dominator

[davelewis]

David Visard has said a number of times they need to make the RPM air gap with a Dominator flange, Thanks for qualifing his theory

[SealofPerfection]

In the late nineties I had a well-tuned 454 bracket motor. 12:1, 0.637 solid lifter cam, closed chamber rectangular heads.
Edelbrock C-427 intake with a Barry Grant 850 on it.
A friend of mine was needing some money and he had a Barry Grant Dominator, brand new, and I bought it from him. I was planning on building a bigger motor after the season. Just for the heck of it, I bought an adapter plate and put it on the 454 just to see if it would take it. I was expecting it to be too much.

It picked up almost a tenth in the 8th mile. 60 ft time was actually faster, and more MPH.
Was quicker and faster across the board.
That was just using a plain old adapter plate.
That was a VERY pleasant surprise

[myz]

Just my most recent experience; I spent big money on a up and coming big name custom spec’d 1375cfm carb for my larger cubic inch race engine. It was spec’d with .126” primary & secondary jets and .028” high circuit bleeds. Even after working our way up to .140” primary & secondary jets as well as .026” high circuit bleeds, we were still seeing 13.6-13.8:1 on WOT dyno pulls that we were aborting. We couldn’t get this carb to give enough fuel. The signal the carb was getting from the engine was also out of wack. As a last ditch effort, we pulled a way too small Gen3 1050cfm dominator out of the box and slapped it on. If I remember correctly, it has some where around 92-96 Holley jets, which convert to .109-.116”. The signal was immediately better, we picked up considerable hp/tq everywhere and the AF ratios came right into range. The custom carb builder wanted us to drill out a set of jets to .146-.148” to see what that would get us. However, we felt that the custom carb was so far “out to lunch”, that doing so would just be throwing a bandaid on a bigger problem. That custom 1375 carb has now been sent to another carb builder, who’s been doing extremely well in the industry for decades.

[UnityMotorSportsGarage]

I love that kind of testing!
Keep up the good work

[richardoliver]

You are an excellent automotive engineer and instructor!!!!

[lucascb]

Arlene Vanke made a dual plane dominator flanged intake for the nascar hemis back in the day, Indy cylinder head has the rights and is reproducing it. It just works.

[davidanderson]

Should be interesting to see what happens on BBC

[shanerorko]

Eric I appreciate your knowledge. I get that you don't understand the triple bleed, but it is actually easy to do, you don't just adjust one jet, you adjust both at the same time keeping the ratio, or skewing the ratio to make a curve.
I work on other carbs like webbers and this is the same deal here.
I'm an automotive cert 3 technician in Australia who has spent 16 years in the trade.
It would be the same with, say 5 jets per hole, you adjust them all at the same time and make a curve of adjustment across the lot.

[joecarroll]

In 2007 for the EMC, we noticed the more cfm we had the better it scored. Hardest part we getting it to pull fuel at 2500 rpm. Good test Eric we always learn something from you.

[jorgegomez]

This video confirms what I did to
My 3 circuit 1050 I drilled out the
Primary and secondary circuit
On the air bleeds essentially
eliminating them now works
Like should left the stock high
Speed bleeds alone

[UnityMotorSportsGarage]

The Dominators meter the fuel so much better.. good stuff

[chaseman]

Hell ya!, everyone thought I was insane for even suggesting this and this validates the theory!
The dominator has such a better venturi design you can get away with massive cfm without loss in low rpm signal & fuel draw and the dual plane accentuates the signal yet more.

[WestcoastCreole]

I'd like to see a dominator on a bbc with a old holley C454 intake manifold

[johnsheetz]

Mark's carburetors are pieces of art! I've never seen one before or know how it runs but that's a beautiful carb.

[terryenyart]

I agree on 2-circuit Holley's for most applications. I hsve seem some large cubic inch (598 & up) engines that are street driven benefit from a 3-circuit, but I use a 2 curcuit on most everything. I like Holley carburetors & run a Ultra Dominator 2 circuirt & it costs me judt shy $1300 delivered. Thats inflation for you😢
Great info!

[hilleryclifford]

Love your channel bro, Edelbrock made a BBC Rec port dual plane cast for the dominator way back in the 70’s or the 80’s???? Help me out guys. Eric, I’m 57 years old and I wish I could remember the part# That being said that was one one helluva combo on 427/454 with a 250- or 500 shot of N2O no need for a giant hood scoop, very stealthy back in the day. Again, I’m reaching out to all the BBC guys that know about this intake.

[johnnyatkins]

I used a Dominator on a 454 GM snowflake Dual plane about 1991 and it ran very well. Only hade the square adapter. Hadn’t even heard of tapered spacers yet. 😂

[flinch]

That was fun. Its interesting that the dominator, once sorted, doesn't get twitchy about jet sizes on your 406 - surprised me for sure.

[generalsixty]

I’d like to see a dual plane engineered with longer runners and less bends. Where hood clearance isn’t a consideration. That dual plane 406 as is with a dominator would be great in a jet boat.

[stuartstevens]

Eric. You are a head porter. Airflow conouseur.
Take a look at the dominator and other carby.
Which one has the most attractive and assistive bellmouth?
For the air to get in faster and more efficiently.
Its obvious.