what all has to be done to a holley 4150 carb (elec choke, vaccum secondary) to make it capable to withstand blowthrough boost preasures? i know that you have to do something so the boost doesnt try to push the gas back down the fuel line or mess up the vaccum secondary.. i also heard that there was a way to tune the vac. sec. so that it only opens up during boost. I only had time to give this a quick search so if you are able to just search this forum, justd rop a link and it will be appreciated... dont think im lazy, im just running on a very tight schedule nowadays.

 

Summit sells a book,how to modify your holley carb - it will tell you every thing you have to do and how to do it.
Including blowthrough systems.