I went from a old 950 untuned Holley to a ProSystems 1050 Dominator. Last month I ran a new best 6.21 @ 110.59 with a 1.39 60 ft. I picked up a tenth and 2 mph with the new carb. but my 60 ft. times are a lot slower ,with the old 950 they were 1.33-1.34 almost every pass. Did I slow down on my 60ft. because I went to the bigger carb. Also with the 950 my ET did not change much with the weather, Now it slows down a lot when the temperature goes up. I best at T&T the other night was only a 6.37 @ 108 with a 1.41 60ft.

At the power you are putting down( based on ET/ MPH) the Dominator is probably too big.
I ran his Dominator on a small block that ET'd a little better than you at 400 pounds more weight, and the Dominator didn't run any better than a 1025 race Demon( 4150 style)..... Unfortunately I sold the race Demon.... Should have kept it and sent the Dominator back.
You might be able to get it to work, I liked the 4150 manners better street driving it( which I occasionally did( W5 motor)

I just took a 950 off my little 318( car has yet to run like I think it will)... Trick little engine masters mill..... But I put a 750 on it night before last and went for a quick jaunt.... Let's just say I am eagerly looking forward to getting back to the track with it. Think that 950 was flat killing the little motor, we will soon see. Smaller is often better.

Try tuning the squirters to help the 60 fts. Dominators tend to come with dual 50 CC pumps and big squirters

My bet is that it is REALLY rich down low............most PS carbs seem to be. That makes it lazy early

Yep.
Did you put timing in it yet???? It needs 39* 40* on pump gas.
And no way is that 1050 to big Don that engine was built around that 1050.

Are you running a carb spacer? If not trying one may help.

I know this little 318 was run on the engine masters dyno with best results with a 950 on it.
I am pretty sure it is going to ET WAY better with a 750 on it. Will know soon. I will have tried both.
Isn't the OP's motor a dyno motor as well?

What shape are the tires in ?

Sounds like the new carb needs some tuning. What was the weather like when you ran 6.21? And the 6.37? Do you have an o2 meter on it? You said the best on TT night was 6.37, what was the worst? Spinning or not? How many TT hits did you make? Did it run better at the beginning or the end of the night? IMHO it sounds like your carb is rich.

When I was tuning my Dart in very good air it ran great as it heated up and we got more humidity (we get a ton) it would slow way down. As I leaned it down the et swing became less drastic. It also sounds like your unturned 950 was pretty close.

I think it is rich also. At full throttle is seems to run fine but it seems to run a little rough on the return road or when I am cruising along about 2500 rpm. Last year I sent the 1050 back to Pro Systems to rebuild it and I gave them all the info that they ask about motor. I have the sheet with all the specs on the Carb. It has #90 jets in it. I am not a carburetor guy, I have not changed anything on the carb since I got it back. I am sure it needs to be tuned.

Sounds like same carb I bought from Patrick( I used to work with him years ago before he opened his business)
Mine he called an 1100, not a 1050. He likes to put big squirters in his stuff, think mine came with 45's. Worked fine, no bog or hesitation. Mine would also load up at cruise rpm, never played with it other than jetting changes, as I know squat about carbs. This on a 13.3 compression 422 inch motor. Had to constantly put your foot in it to not foul plugs, but at WOT worked perfect....... But no faster and way worse manners than that 4150 style carb. It can probably be tuned with bleeds to run better at part throttle, but I bet it will never ET any better than what you had. Might indeed make a bit more horsepower on a dyno, but not on your time slip.

I'll call Tha carb guy and get him to tell you what it needs.

I guarantee in the RIGHT hands the dommy would be faster and every "custom" carb I`ve worked on so far had horrible idle/transition manners and my dommy is awesome on the street and track and even get decent mileage and that's w/91 pump gas......................

Don it's already faster 2MPH AND .1 tenth
The intake built around 1050 so when carb is right it will smoke the 950 but WTF do I know I just built the engine.

And AGAIN I ASK WHAT TIMING IS IN IT??

Have you replaced valves spring? When I fixed heads up said one more year on spring.

Was that 2 or 3 years ago?

when I went Dominator had to come way down on the squirters to get 60 foot back then gain a smidge 60 foot.

I have not changed springs and the timing is still 35*.
It was 3 yrs ago when you worked on heads. I have not made that many passes on the motor since you worked on the heads ,maybe 50 1/8 mile passes.I upped my shift point the other day just to see if it made any difference (from 6800 to 7200 rpm and it picked up). I figured if the springs were weak it would not have picked up when I raised the shift RPM.I know I need to up the timing. But I figured I need to find out why it lost 60ft. first. I may be wrong. I appreciate all the help. I tried to post the sheet from ProSystems but I could not.

Sorry Brett, poster didn't mention the intake was designed to work best with a dominator.
The modified intake I bought from you years ago definately DIDNT work better with a dominator than a 4150 carb, I did lots of testing to prove it, and on a motor that makes more power than the OP.... So they don't always ET better.
Edit..... I think a 4500 built manifold has advantages, no doubt.

Here is some of the specs on carb.
Primary lean-rich Secondary lean-rich
Main jet 90 87-94 MJ 90 87-94
Hi air 36 40-30 hi air 36 40-30
Int Air 76 80-55 int air 76 80-55
Int Fuel 40 int fuel 40
Idle air 52 70-40 idle air 52 70-40
Idle feed 35 idle feed 35
PV feed 86 Pv feed X
PV PL PV PL

It has 40/40 squirters

I wrote these in columns I do not know why it put it all together.

Most any Dominator from certain builders, that is specified for a "small block" is going to be WAY rich down low. Why is that you ask.....small motors, big carbs, equal low air speed down low. So to be sure it comes on the brake clean, they tend to put WAY too much fuel in it down low. Does it HAVE to be this way? No, of course not, just needs to be properly tuned. The motor in question obviously needed the Dominator, as with even a poor tune it picked up MPH.......that's power. Now if it slowed in 60ft, that is reflected in the ET, which may not be better, but power is power and more of it will make the ET quicker with a proper tune.

Haven't heard many if any say I'm gonna put a 4150 on to go faster then a 4500.
My 440" made 40hp from proper timing...I saw it with every degree added.