I recently read something VERY interesting.
On the 4150 based double pumper carb......if you EXTEND the vent tubes UP and into the throat of the Carb Hat,.....it dramatically influences the A/F ratios and you can effectively reduce the jets 8-10 sizes down.
It still means that to Blow through mod a carb, you need solid floats, plug the choke rod hole, epoxy the air bleeds, and mill the choke tower off (unless using a later HP Holley or Proform center).
I am soooo looking forward to Boost on my Single Turbo 360 Duster project.
I just Hangar18 modd'd my carb last weekend.
Read it here:
http://www.theturboforums.com/smf/carburetor-boost-tech-questions/vent-tube-extensions-wow!/
View it here:
http://i40.photobucket.com/albums/e237/kpgsx/ventextentions.png
