Ultra XP850 Almost there!

The first thing I’d do is get rid of those huge MAB’s. That’s one reason why your jets are so big plus the power valves.

Thats also why it runs better with late opening power valves. You are starting the booster way too soon with those huge MAB’s.

I start at .026 and never go over .030 and I don’t like doing that.

With a good booster I can use something like an .022-.023 MAB.

That’s just too much MAB.
wait a minute. I thought smaller bleeds increases fuel flow by starting the booster sooner.........

Says in my Holley book smaller bleeds increase fuel/ richer. Do I have it wrong?

I have run smaller bleeds, but man if i went to .026's, I'd have 60 something jets in all the way around. Not sounding right for a 600-ish HP smallblock.

But i will listen to your explanation.