Stumble off idle -

[Grubby]

Orange, screw in the top hole.

I suspect your set up should be exactly what I need.

John

[Bobcat]

Grubby .... rather than going bigger on the squirters and changing cams , look at the location of the primary butterfies on the transition slot . You should have .020" or less showing . If you are too far into the transition slot , you can get an off idle stumble . Another real simple "cure " to try ... richen up the mixture adjust screws about 1/4 to 1/2 turn ( out ) from where you get best idle .
Once you are sure you aren`t too far into the transition slots and going richer on the mixture screws doesn`t help , then look at changing cams/squirters . I`m at 31 on my squirters and no stumble at all on a big block 482 . Transition slot can barely be seen . Believe it or not , sometimes it is the simple things that work .

Bob

[patrickt]

Listen to Bobcat on this. I'm at 31, orange cam with the screw in hole #1, with no stumble. I would concentrate on making sure your carb is set up as per his post, of course double check your float levels, check your pump arm clearance as per the vid, and clean everything (yes, air bleeds, down the vents, etc.), richen the mixture a bit and see what happens. Honestly, if it was in front of me and you told me that you had been drilling the nozzle yourself, I might just buy a new one for $20 just to make sure there wasn't a problem in there somehow.

[jhv48]

Make sure your timing is spot on also.

[patrickt]

BTW, I think 99% of all carb problems are dirt related, or rather "goo related." You really can't keep them too clean. Today's gas turns in to a goo that is like maple syrup. Here's a shot of my recent leak and that brown stuff is dried gas that is sticky and gooey, just like syrup. And I use the Lucas Ethanol Gas Treatment, that has seemed to help over the last couple of years....