I didn't have the vacuum advance hooked up at all. I tried ported and settled on full manifold vacuum. This allowed me to turn down the throttle blades and provided a much cleaner burning idle.Since im feeling contrarian lately, I like my ported advance. I have tried to tune for full vacuum a couple time and can't get it to idle below about 900 and my gitty-up is gone. Ported I idle about 5-600 and can induce whiplash.
What am i doing wrong?:grin2:
Is the OP saying he was using ported prior to this? If so and the blades were open the port was open. When your carb is right you shouldn't need any throttle open at all to idle well
When setting timing, the vacuum advance should be disconnected and plugged regardless of ported/manifold vacuum.^I've had the same experience. I have tried full vacuum in both my 67 C10 and the 65 Mustang and each case I went back to ported for a better idle, running condition.
Full manifold vacuum advances the timing at idle whereas ported should have zero affect on vacuum advance. In my mind it's easier to tune a car with less variables and with zero vacuum advance at idle I can get my car to run better and more consistent?