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OK, Sometimes things need to be said that sound harsh. This is one of those.

i have a 477 BBC with 12.5 to 1, 1050 dominator with 92 jets, brodix brodie heads, makes around 650hp.

question: I am trying to clean the plugs up a little and motor blows a little black smoke when revved and a little when making pass. I run NGK 8's and timing at 34 degrees. I am looking to pick up a few more 10ths and would like any suggestions on jetting. Plugs show one complete turn on threads of black (not sutty) and browned porcelin.

thanks for any suggestions
Your questions can not be answered by anyone here. It is called tuning and tuning is something you have to learn by years of experience. You have to know what to expect as you make changes.

You might be able to get in the ballpark to get an engine to run with the results from the experiences of someone else. Each application of the same engine will not always want the same thing. Tuning needs even on the same engine will change day to day track to track and at times minute to minute.

1050 dominator with 92 jets
Any idea how many different carbs there are that are 1050 Dominators? Any idea in all the Holley 1950 Dominators Holley made the number of carbs that were needing different jetting from others of the same size?

Next thing;
brodix brodie heads, makes around 650hp.
Brodix Big Brodie? Ok just which Brodie? Your guessed power may be optimistic as well.

The NGK 8 is a very cold spark plug and I doubt this engine would need any colder than maybe a 6.

Ed
 

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Ed,

I thought this forum was to share each others experiences in the hope to shorten the time of all our goals which is to go FASTER. I am sorry you are offended by my request for help, but it seems others on hear do not mind sharing their experiences.
I am offended by your response sir.
Sharing is what I do. No secrets withheld from me ever unless it is current Professional secrests from others who share info in confidence about thier programs.

Your question did not offend me in the least. It is just an impossible to answer series of questions.

The guys trying to help you probally could do it much better if you tell us what you have instead of all the vague descriptions of parts.

I say Again
What Holley carb do you have?
There are tons of different 1050 Holleys and they are all with differences. Not the same at all. Some here have begun guessing at what you have and that is the root of their suggestions. IE (#8896) or this suggestion, (might mean a 9375) I would guess that over the years Holley has made over 50 separate 1050 Dominators. Which one do you have?

THis tells me you are still far off;
I have been testing and have gone from 94's to 92's and picked up 3/10's in a 3500 vehicle. After the jet change we went to 34 degrees timing and picked up 2/10's.
Whatever Brodix heads you have they are conventional chamber if they are called Big Brodie. That means you do have a piston dome of some sort. Conventional heads with domes like more ignition timing in the 38 to even 44 degree range.

Don't go cranking the dist to 44 degrees.

If your engine is performing better with less timing than it should have then you are needing more fuel in it.

When tuning engine forget ET they mean zilch. The only thing that matters is mph. You guage your tuning changes with two back to backs after changing tuning and then you have an average mph that the change made. Never make big changes at once unless you know it needs those big changes. So you are feeding it enough fuel for the huge open chambered heads at 12. 50 -1 compression to run better at 34 degrees ign. If you bump fuel jets up it slows down because you do not have enough ignition timing in it to handle that extra fuel. Or with same jetting you bump ignition up a couple of degrees but it doesn't do any different and your plugs look hot. Put more fuel in.

Like I said before;
Your spark plug is too cold for your engine so it will falsly be liking less fuel and less ignition. The rick is not to see how cold of a plug you can run. It is the opposite. See how hot of a plug you can run without detonation with a good tune in ignition and fuel. Example In 1968-69 Chevrolet had a bad bow engine called the L-88. It had a rompin stompin flat tappet cam of over .600 lift and compression ration of 13.50 -1. From the factory as they came with a little track tuning, they were doing an honest 500 hp with 427 cu in. The recommended NGK Plug for that engine is either a NGK 4 or NGK 5. I use NGK 7 and 8 for doing all motor tests with engines on all motor of over 900 hp to 1350 all motor hp. (Those are built for serious nitrous with the compression you have and at times a llittle more) Use or try a hotter plug in it with more timing and more fuel.

Ed
 
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