Hi, I have Doug Roe's book on Rochester Carburetors, and in it is a flow-ratings chart...
It says that:
Qjets with 1-3/32 venturi is 750 cfm
Qjets with 1-7/32 venturi is 800 cfm
and....
Dualjet with 1-3/32 venturi is 227 cfm
Dualjet with 1-7/32 venturi is 287 cfm
but are those numbers comparable, or is the dualjet rated at 3.0 hg?
I have long been searching for the correct cfm rating for the primaries on the Qjet.