Its Time To Build Some BOOST!
Bill the extension are to equalize fuel bowl pressure. I'm sure your aware that the fuel supply to the carb is a must and it all starts in the fuel bowls if you have a float set to high and a/F ratio might read fat or rich or you may even over flow the vent tubes, and if the floats are set to low chances are you will starve the motor of fuel and read lean a/F ratio.
Now with blow thru carbs sometimes there's inconsistencies in flow in a carb hat so the stock vent tubes don't always see equal pressure by bring them up into the mouth of the hat it keeps that positive pressure on the fuel bowls.
I hope this explanation helps here's a pic
Bill I was also thinking have you and Freddie thought about unhooking the secondaries and trying to tune on the primaries only? Ryan started this way and ran low 11's if you do the math for cfm calculations a slant calls for around 400 cfm that's only Alittle more then half your 750 its just a thought.
Aaron
Bill the extension are to equalize fuel bowl pressure. I'm sure your aware that the fuel supply to the carb is a must and it all starts in the fuel bowls if you have a float set to high and a/F ratio might read fat or rich or you may even over flow the vent tubes, and if the floats are set to low chances are you will starve the motor of fuel and read lean a/F ratio.
Now with blow thru carbs sometimes there's inconsistencies in flow in a carb hat so the stock vent tubes don't always see equal pressure by bring them up into the mouth of the hat it keeps that positive pressure on the fuel bowls.
I hope this explanation helps here's a pic
Bill I was also thinking have you and Freddie thought about unhooking the secondaries and trying to tune on the primaries only? Ryan started this way and ran low 11's if you do the math for cfm calculations a slant calls for around 400 cfm that's only Alittle more then half your 750 its just a thought.
Aaron