ported or manifold vacuum for advance?

[John D]

My '79 with a AFB carb uses a manifold vacuum tap for advance on the Mallory HEI distributor. Mild original 350. My other 2 AFB applications (59 Stude truck 289 and a Ford 302 in a Champ) use ported vacuum off the front of the carb. Advice?

[Gunslinger]

With an Edelbrock version of the AFB their manual calls for ported vacuum.  I will assume the original AFB...whether Carter or Edelbrock...would be the same.

[mfg]

On 4/20/2023 at 5:43 PM, Gunslinger said:

With an Edelbrock version of the AFB their manual calls for ported vacuum.  I will assume the original AFB...whether Carter or Edelbrock...would be the same.

Ditto!

[John D]

I don't think the 79s came with an AFB or a Torker manifold. Also I think the distributor cares more than the AFB would... well, easy enough to try it I guess.

[John D]

also note- after perusing the HAMB and other forums for SBC tips, some of my tunability issues may relate to the use of the MT-1 (Torker) single plane intake. With 3.08 gears and a 700R4 she rarely goes past 3000 RPM in normal driving, and single planes like R's.... Looks like I'm shopping for a Edelbrock Performer EPS 2701 next week. There are cases to be made for manifold and ported vacuum use on the SBC.