Inliners International Forums General Discussion Hi Performance New Guy Here. 68 Camaro with an L6 250.

If you have 18" (inch) of vac, how do you come up with the idea that a 9.5 PV is ideal?

Great to hear it is running better. You are learning how to tune a carburetor.

I suggest hooking your vacuum gauge up and drive it around. If the PV is too high of a #, the PV will open when you do not want it to. Causing poor fuel economy. I bet with cruise RPM you will see around 15". With slight throttle input, the VAC with drop below 10.5 really quick.

Could the power at 90% throttle be a engine thing? Is this a stock engine? Meaning the cam/ head.