Carb flow

[flattop1]

No Swirl . All my sa engines have . 750 carb .
Some like .710 . You can get some breakthrough at .750 .
The carbs get weak also .

 

[CarlsonMotorsports]

Remove the swirl. I'd suggest stopping at .735" on the bore, unless you are willing to replace them occasionally when they break. As flattop mentioned, I've seen them bore through the metering holes behind the jet @ .750" before. They tend to all break right at the counterbore (about 1" from the flange.) You'll also need to re-cut the throttle shaft for the bigger bore and hand make a butterfly from .040" material.