What should be the correct AFR for a 13B bridgeport engine?
at WOT and at iddle
old school mild bridge.
It has 3mm racing beat carbon seals.
webber 51 carb/ racing beat manifold.
120-240-F8-43 venturi carb set up.
racing beat headers. pretty much open exhaust.
2 msd6al.
NGK 115. racing beat wires.

 

14.7:1 is the stocheometrically correct AFR for all gasoline internal combustion engines. Best power is usually obtained at 12.5:1-13.0:1.

Andrew

 

Andrew is right; they like to run rich. Your jets should be close; use an air/fuel ratio meter to get the mixture perfect, make sure you don't lean out at top end.

 

I have a AEM wideband pluged after the Y.

 

For a bridgeport, your biggest changes are more likely to be with ignition timing, rather than A/F ratio.