So for you folks saying plug the vent, what do you do about the flapper style on the older holleys? If fuel spillover is the issue, why do they exist at all?
I say plug the vent if it makes you happy. But it is there for a reason.
If you want to run the vent open without the emmissions connections and you dont like that gaping hole on the vent, put on a short hose, plug the end and drill a small hole in the plug. thats what I did. Paint it black and most folks wont notice. What does it matter, cause unless you connect to the emmissions system it is not stock anyway.
BTW, I had a bowl overflow due to a stuck float. Some of the gas ran out the throttle shafts and onto the intake and very little, if any, made it out the vent hole. Why? Cause the vent hole is small and the vent is near the highest part of the fuel system. High fuel levels cause flow out the primaries into the intake before flowing out the vent.
Dallas