carb jetting and a/f numbers

[wayfstyt]

Is there a percentage or a way to ball park figure a jet change based on numbers from the a/f reading. For example sbc,naturally aspirated,carb'd race engine... lets say i make a pass on it and it has an a/f reading od 11.5 to 1 . ball park.. how many jets sizes smaller would i need to go. I know it all depends on the variables but i was just wondering if anyone had an example . Im going to the track this weekend and would like to know what to expect. thx tim
its a barry grant race demon carb.

[TurboNova]

4 jet sizes is usually 1 a/f ratio from what I have found on Older Chevys. Ballpark but works.

[FAST Tech Maxwell]

Good info, Brian. I learn something new every day.