Quote:
The Nikki return has an orifice in it that relieves pressure and these were set to deliver no more than between 3.75 and 4.25 psi to the needle valves, depending on the model carb.[/b]
I was told that my carb (Yaw prepped) needed bewteen 2.5 & 2.75 psi to run properly. I have a guage that reads 5 psi full scale but only hook it to the same port on the Holley FPR that the guage is attached to in the pictures when needed. The thing was too damn expensive to have it riding around under the hood.