Dual Dominator vs. Single Dominator Power?

I am currently running a 555 in my FED and it is very fast but not quite fast enough to run NEI (7.60 index). The motor is a merlin block with 15:1 compression, bowtie race heads (380cc runners and ported) with a dart intake and Chuck Nyutten dominator (not sure of the size). The cam is over .800 lift but not sure of the specifics but the motor will turn 8k. My buddy has a dual dominator high rise he had on an old motor, and I think I might want to try it but have no experience with this setup and wondering if someone has some input on any power increase (if any) I might be able to get. Right now I am hovering around 8 flat so I would need to pick up 3 to 4 tenths.
thanks
Scott

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Originally Posted by burnout1969

I am currently running a 555 in my FED and it is very fast but not quite fast enough to run NEI (7.60 index). The motor is a merlin block with 15:1 compression, bowtie race heads (380cc runners and ported) with a dart intake and Chuck Nyutten dominator (not sure of the size). The cam is over .800 lift but not sure of the specifics but the motor will turn 8k. My buddy has a dual dominator high rise he had on an old motor, and I think I might want to try it but have no experience with this setup and wondering if someone has some input on any power increase (if any) I might be able to get. Right now I am hovering around 8 flat so I would need to pick up 3 to 4 tenths.
thanks
Scott

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Don't think I would...To me the trick to running an index car is to eliminate as many variable as possible in order to maintain consistancy and another Dominator sitting on top just doubles the chance for something to go wrong in the carb system. If it's a built carb, should have a serial number or some sort of identification that the builder put on it, first thing to do would be to get hold of Nyutten and see how many CFM it is and go from there. Also, would be good to know all the cam specs, what type of ignition, etc. Probably a lot of ways to speed the car up other then bolting on another carb....

Dave, thanks for advice. I was thinking the same thing because this motor was specifically put together with this combo, but my buddy has this just sitting on the shelf. I am trying to get the car down to that index before the hot rod reunion next month but don't think it is going to happen this year. What I need to do is send my converter to continental to be redone for this motor and car. It currently is only a 4500 and should be around 6000 or 6500 which should definitely help the 660ft time. Not enough time or money as usual. LOL

lose the old bow tie 862/861 s? head s the intake runner is not the best any more i spent $1000s on them they were ok in there day but most all the time the runner was to big and lazy try a profiler intake single 4500 i would think all or better then a 1150 cfm the last set was good port 375.5 cfm @800 bad port 375.3 @800and on ex 280.4 @750 no pipe i can get a great deal on any of the cnc Darts

Pat the heads are 861 and are the second design with raised intake and exhaust ports. Just trying to squeeze a little more out of this thing without spending a lot of money right now. The cam specs I got are Crane cam 280 degrees @ .050 on the intake and 292 degrees @ .050 on the exhaust on a 110 degree lobe center but nobody seems to know the lift.

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Originally Posted by burnout1969

Pat the heads are 861 and are the second design with raised intake and exhaust ports. Just trying to squeeze a little more out of this thing without spending a lot of money right now. The cam specs I got are Crane cam 280 degrees @ .050 on the intake and 292 degrees @ .050 on the exhaust on a 110 degree lobe center but nobody seems to know the lift.

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Don't know if it's valid or not, but most of the cams in that range in my Crane catalog are 0.714" lift. That particular cam of yours is not listed.

Also what about running synthetics in motor,trans and gear oil. Repack your spindles with fresh grease, theres some pretty slick stuff now days that can free up a little power. Even try some ceramic bearings and light oil for less resistance. Have you checked your toe in to see if its correct. have you checked the alignment of the chassis? Tire pressure front and back, check every run.Are you using any wings for down force? Might want to play with different angles, Keep a log of angles used for different weather conditions. Heck you most important tool will be keeping a log of EVERYTHING. Put your logs on a excell program or similar and this will help making adjustments to keep the car more consistent.

Quote:

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Originally Posted by burnout1969

Pat the heads are 861 and are the second design with raised intake and exhaust ports. Just trying to squeeze a little more out of this thing without spending a lot of money right now. The cam specs I got are Crane cam 280 degrees @ .050 on the intake and 292 degrees @ .050 on the exhaust on a 110 degree lobe center but nobody seems to know the lift.

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all of the 861 i have work with were raised intake port along with the ex .that dog leg part of the port his not that hot and the eldelbrock super victor were the same head with out the ex vein .you did not say with intake you have on this engine .what ratio rocker arms ?1.7. 1.7.5 1.8 ??? them heads alot of guys closed down the port with A&B putty that is what was done to my heads and i have done it to others heads.stock the runner was to big with a bigger engine you may leave the port stock or open it up but gets very lazy and have seen over work heads that just do not work but look nice,,, you would need a big lift cam and very hi rpms and still may not work so hot . i know abit about them heads i spent alot of $$and time on them heads and do have the super vic on my 632 donovan them heads with work are ok but your looking at 25+ year old pro stock heads much better heads out there i seen my heads flowed stock .flowed rework .and the last time i re did the valve job and rework the heads the numbers i posted were the last time when i rebuilt the 572 for the customer i know what numbers my engine made with them heads and two cams with a re work super vic intake i did and a tunnel ram with 4500 s the tunnel ram made some more power but they did the cam at the same time so hard to say how much he realy pick up i think it was 100 hp over the street cam and intake was 750 hp @ 6500 and 850 @ 6500 heads dead headed the com .i think... but he sprays it500hp+? as it was built for spray no numbers on spray never would tell me:D and i built the dam thing