´68 OrangeSunshine,
My Holley is the #8007 390cfm 4160. It has one power valve in the primary metering block. What is the best method for determining the correct size or value power valve that should be installed for the mods that I have installed on my 194. Diesel Dan posted that there is just one size yet a mechanic in my town has given me a couple different sizes to try. One is a 2.5 and the other is a 6.5. My guess is that I need to install an accurate vacuum gauge, run it into the car so I can determine the vacuum value that it develops when I would want the secondaries to open. Am I on the right track.
