Harsh yes but sometimes people need a slap in the head when it comes to blowthrough. I dont have time for people to theorize about what there package or manual tells them. I tell it like it is, not how others think it is.
Hey its not my motor wtf do i care.
This is why it gets such a bad name. People dont listen to other people who have done it. MANY TIMES! DRIVEN FOR MANY YEARS! if the man does not want to listen to the facts not the " I think's" then its over he will blow his motor and say blow through sucks and does not work.
You need efi pump bigger return line to keep pressure in check. Or use vent line via TonyD's idea. You need 1:1 rrfpr tapped at the hat not the mani. At the mani is to late BOOM! Most important you need to listen and take it as the law.
Flow is good but means nothing if it cant combat the pressure inside the carb that you are forcing in it.