Blow through with vacuum secondary Holley Carb.
Thank you, as I hadn't considered that.
I have a blow-thru setup running 15 pounds of boost on my 225 slant six.
When I was gathering parts for my project, I was told repeately, everywhere I searched, "Get a mechanically-operated secondary carb, not a vacuum-operated one." Everywhere. I never knew why, but when I asked people who were "in the business" and, should know, they ALL told me the same thing... So, I got a Holley 4150 "double-pumper," and it works great. My advice, though I am ignorant as to the reasons, I'd go with the "experts" who advised me, and say, forget a vacuum-secondary system if you're running a blow-thru carburetter.
