Another q, Does anyone run jet extensions with these floats? All the floats are notched so do I need 'em?

I don't

Still got issues, also my AFR's change with each gearchange. Usually in the 10's in first 11's in second and 12's in 3rd. Steps coincide with gearchanges.

You have tunnel ram floats with jet extension notches?

Hi Jerry. Yes we got these and tried them. Still all sorts of weird issues with fueling. I'm guessing we need to seal the carbs to the scoop and run a decent air filter before we can get to grips with it.
Our season is finished now lots of work to be done on the car before it's next out, modifying they scoop is one of them.

Hello Tig. You shouldn't have floats with notches, you need floats that are shaped like a wedge on one end, these will be orientated left and right with the wedge facing reward. I have never seen tunnel ram floats with jet extension notches and wedge features on the same float. Jet extensions are not necessary (or desired) with sideways mounted carburetors. I would go back and visit that before trying anything else.

Interesting Topic. I have been running a tunnel ram for the past 6 years and experienced a similar set of circumstances a few years back. I had been running with zero problems and then changed cylinder heads to E-Victors. The change moved the carbs very close to the six pack scoop. The Car would launch hard but then a strong bog/failure about 40 feet out. What I found was a simple fix, I removed the hood, exposing the carbs with no restriction above them, the problem resolved immediately. Since then I have been running a flat hood with a halibrand style scoop. No more problems.

I have standard 4150 bowl floats with no jet extensions. Floats are set a little high but nothing radical. No way to say this is the problem you are experiencing, but it is a simple experiment to determine.

As a side note, I came across the idea of removing the hood after talking with very well known local pro-stock carb builder. His rule of thumb was simple, you should be able to place your fist between the carb and the top of the scoop, if not, your experiences may vary.

I also had the same problem on my Dart with a hemi scoop took it to the track with a dominator on top of 2" adaptor and victor intake, did 3 runs, first was 121, so i jetted up a couple, the next 2 were 122, on the same day i swapped my old 950 with 2" supersucker back on and it picked up 5 mph the next 2 runs. Ran the car without the hood next time out with the dominator back on and it ran it's best ever speed.
Mick

The floats have wedges and are fitted so the wedge is to the rear, they also have notches for jet extensions. They are not the same as the ones linked to at the start of the thread. http://www.quickfueltechnology.com/fuel-bowl-parts/nitrophyl-float-wedge-primary.html
Pretty sure my hood is causing a problem as we can only just get a 2 1/2 inch tall filter in there. We have filter tops too which are real close to the hood.

If it's lift off do a run without the hood and the filters, if it cures the problem then get some less restrictive filters and fit a different scoop.
Mick

My Dart does the same thing. Leaves hard then falls. I'm going to try some of the above mentioned fixes. I tried the hose between the bowl vents and it helped some, but didn't get rid of all of the bog.

One major problem is carb to scoop clearance. I only have about 2" above the top of the carbs and run two short about 4" round air cleaners.