Hi All
I'm running a 440, 509 cam , big valve heads and 17/8 headers. I'm using a mancini distributer (factory-set performance advance curve).
My question is do you hook up the vacuum advance to ported vacuum . Or just run it with out the vacuum advance hooked up. Swear
I have heard not to hook up the vacuum advance. Please help not sure. Thanks for your help.

Neil Nemitz

if it's a street car i would definitely run the vacuum advance hooked to the ported nipple. some of those distributors have fairly slow curves for a cammed up engine.

Neil, why don't you try it both ways and see which one you like the best
I've ran my street cars both ways and didn't see a big difference in performance or fuel mileage. I do recurve all my stock and race distributors with mechanical advance (14 to 18 degrees BTDC and 34 max BTDC above 1500 RPM) but I'm a drag racer and like speed and rapid acceleration so maybe my input is not valid

Thank you for your answers . I have the vacuum hooked up for now. I will try it with no vacuum