I am tring to decide on a carb.Engine is a 451 indy srs stock port,10.5 comp solid roller.Any big difference between a 1050 and 1000 4150 carb ?

You can run anything from a 950 4150 to a 1050 4500 8896 Dominator.

Here is what you have to ask yourself. Do you have enough convertor, gear, and cam, to launch hard with the big carb, then the answer is the 1050 Dominator...

Now if you a lighter stall, a little less cam, and a little less gear, I would put a 950-1050 4150 carb on it.

If you have a tight stall big cam, I would put an annular 950-1050 4150 carb on it.

For the record, we run a 512RB big port EZ-1 head with a 950 4150 carb, 4800 stall, 4.56 gear, and it has been awesome. Would we go faster with a 4500 carb, yes, but how much faster, .1? maybe. And we would have to add a big spacer, or get a new intake.

I say two tenths . I went from a holley 950 to a holley 1050 dominator and picked up two tenths .

I didnt think there would be a big difference in the two.Probaly going with a 4150 that would be easier to set up on the dart.I have a 850 demon but i think i will get a 1000 cfm holley.Thanks for the help