Holley stumble trouble

.004-.006 is a huge MAB change especially when the OP has no idea what the MAB is now. IMO you fix the idle transition first, then move to primary.


I get that. But the OP has been bunting. It’s time to swing for the fence and get the thing to lose the stumble.

His work won’t be done any time soon. Once he gets the stumble out, it will be pig rich again on the T slots. So he’ll have to clean that up.

It’s quick the pin the MAB. And spending all day drilling .002 at a time is wasting time when he’s been messing with this thing for awhile now.


I still believe Holley (and everyone else cloning these carbs) delayed the mains because they are so pig fat everywhere. If they brought the booster in any sooner, it would be all the worse.


Just my .02 based on what I’d do.

Edit: I forgot to mention that when it gets on the booster quicker it will most likely be on the fat side on the main jet. But he needs to get the stumble out, the go back and work on idle, transition, cruise and the WOT.