Originally posted by: Pacfanweb
Originally posted by: Toastedlightly
Originally posted by: winr
My 1965 Ford FE 352 V8 gets it vaccum from the manifold.
I thought most 318s used the vaccum from the carb.
You set the mechanical timing without applying vaccum right?
Also, have you tried driving it with vaccum from the carb?
NOTE: I type real slow......................
I have no source on this carb. It is an old Holley (model 4160). I only have that option. Mechanical timing w/o VA was set, and applying VA leads to backfiring (too much advance).
Havn't tried driving it, but I can hear the bad idle at 800 RPM (idle speed) and 1500 RPM (choke speed)
Well, you might be screwed. I'm nearly sure you need ported vacuum, but if you don't have that option, you'll have to set it basically by trial and error, e.g., how high can you set it w/o pinging, but low enough that it'll still start okay.
Forget manifold vacuum, that'll put it as full advance at idle. And you'll lose the advance as you accelerate....the exact opposite of what you want.
A good alternative, if you're stuck with that carb, would be to get an aftermarket distributor that has mechanical advance only. Usually, they have about 20 degrees of centrifugal advance, so you'll still get some more timing as your rpm's increase.