I live at over 9000 feet above sea level in colorado. I have a 1973 f-250 with a 360 in it. It has dual exhaust and a motorcraft 2100-D 2 barrel carb. The engine is stock otherwise.
What jets sould I generally run? Ball park? it had #50's in it but they have been drilled out.

Thanks

 

I live down here in Aztec, NM at about 6500ft. I ran #61's in my 2150. It ran great but then again I never did mess with them a whole lot so what I thought was great just may have been average.

 

So put some undrilled 50's back in it and see how that works. If still to rich, start droppping in size from there. But if I remember right those jets only have something like 46's for as small as they go. I have some 48 for that carb but since I'm at sea level, never used them.

 

On Jets, I used #52 for going up and over the passes to the north. They seemed to be best at about 8,000 ft. This is with a stock 360.

Luck to you.

Kevin

 

To climb passes in AZ I figured out that it was the full-power circuit that was ruining the power. '75 360 T18 2100 2V As an experiement I defeated the full power circuit and hauled butt over a certain pass in forth gear with a full camper and a dune buggy in tow that previoulsly 3rd was too high of a gear for it, mostly had to use 2nd.

On your main jet size, there's no set number. :/

The trick is, is to have several size jets and swap them out and figure out what's too small and then go up a size or two until it smooths out.

I've got quite a few jets and booster assemblies etc that I've collected from scrap-yard carbs. I think it would be cool to pass them around. I also have jet reamers I bought from Claude's Buggys years and years ago. A guy can make in-between sizes with those and a pair can be made closer to each other than the factory ever thought about doing it too. ;)

50's sure as heck sound too small to me! :/
Maybe that's because of the full power circuit is more than enough?

With no full power circuit I'm running homemade 58's and it shows good power at 9000ft.

You know a 1/16" drill bit will turn some small ones into 62.5s right? ;)

If you've got some numbered drill bits you could prob'ly figure out pretty close what the real size of your jets are and we could go from there?

Alvin in AZ
ps- booster assemblies, especially their emulsion tubes is a subject I would like to get into here someday... I discoverd a "secret". ;) The local dyno shop told me "you figured it out" ...when I told them what I discovered and asked if this is what they do to get the 2100's working so good. :)
pps- I need to scan some images of emulsion tubes first

 

Jets are normally flow rated and drilling them out gives you anything from 4 sizes above or below the number you are shooting for. As to the power valve curcuit and control there of; they are designed to fatten the mixture so that you can run small mains to improve fuel economy. There are many choices of when to open them also. You need to go to the Holley site and read up on this stuff in their tech section. FYI the Ford carbs are a Holley in the way they work, reshaped to defeat any patten infringment.

 

thanks for all the great responses. I ordered a set of 48's and a set of 52's to see which work better. I borrowed a set of 58's and i could still run the thing without the accel. pump linkage hooked up. I figure at 9300 feet above sea level, i gotta run it pretty lean....

thanks again to eveyone..

Brad