dominator on a 540
 

I have been having a hell of a time tuning my new mill....I have had people tell me pull the power valves and some say leave them in.................................Can someone please tell me what a na 540 9.5 to 1 comp, with a dominator braswell 1050 , where i should strart as far as power valves and jetting.........I tried to use the block offs and i am at 91 jets now and still to lean...........Help please..................


I am so close...........

Use a power valve. You can do a search on here for power valves & you might get some better ideas as to which one you will need to start with. I would start with a 4.5. A 4.5 will open when the manifold vacumm goes below 4.5"

97 squared and #5 power valves is what i run on a 454w/blower.

first of all is this a 2 or 3 circuit Dommy?? marine specific carb??

muy' importante' question.....

It is actually a brasswell, i am at the point i need a new baseline to start from........1050 need guys that run a 540 with big a cam good guts and great exhaust.........No power valves has been killing me i cant tune this bastard.......



HELP PLEASE, TYLER,TOMMY,JC,ANYBODY !!!!!!!!!!!!!!!!

you didn't answer my question..

There are many different Dominators set ups. However most of them seem to come from Holley with square jetting at 90 and #6.5 power valves. Since you have 91's and no power valves, it would seem that you are lean. A power valve adds about 6 jet sizes. Teague, in one of his tech articles in Powerboat mag recommended a 8082-1 Holley 2 circuit 1050 with the addition of 2.5 power valves as a good carb for a high perf. 540. Mine has 92 jets and 3.5 power valves.

this is a very good suggestion, provided you have a TWO CIRCUIT Dommy. If you have a 3 circuit, you'll NEVER get it tuned right......

JH

Mine is a Holley Dominator 1150 CFM #7320 (2-circuit) with 87 X 87 jets and 3.5 PV.
With a big cam, you may also need to reduce the idle air bleeds 3-5 sizes (richer) if a high idle setting in neutral is causing you are opening the throttle blades to the point of pulling fuel out of the transfer slots. A good indicator will be if the 4 corner idle screws are unresponsive.
I agree with the comments on a 3 circuit carb...sell it!

According to Teague, in the same tech tip, 3 circuit will always run too fat in the midrange.