Join Date: Mar 2001
Location: Cedar Rapids IA
This goes against Hoosier here and I haven't run my engine yet so my comments are only based on what I was told... by multiple people...
The vacuum line you speak of... is that going to the dizzy, or the carb? if you're talking the dizzy line, so you take that off and plug it so the vacuum advance will not affect the setting of the initial timing. You're trying to get a baseline at that point, and any little RPM will create a small amount of vacuum, which will make the dizzy advance....
Now if we're talkin' vacuum at the carb, or a mech dizzy... all bets are off, but I know for vacuum advance dizzy, as mine is, that's what I have to do.
'66 Mustang, 302, front chin spoiler, R-model valance, '67 style Shelby hood, custom trunk and console.