[Fot] top end lean w/ webers

[riverside]

I am trying to get the carbs tuned on an
autocrosser w/ dual 45's.

I am going lean above 3500.  went down 4 steps
(one at a time) with the air corrections and got
some improvement (goes to a surge now instead
of complete flame out) and pulls to 4K before trouble.

Motor idles well and pulls strongly until the problem
arrives.  no stumbles.

Any of the weber running folks have any suggestions before
i buy more brass?   thanks

art de armond