Originally Posted By: Lifeguard
Originally Posted By: mshaw230
I believe my original carb was non-ported. It idles faster with non-ported, so it must be better, eh? I just have to watch for knocking upon acceleration. I'm running premium.

I did some adjustments on the accelerator pump today. I tightened up the nut on the plastic lever which should cause the pump to back off more and maybe have more total throw. Almost all hesitation at low throttle is gone. There is still some hesitation at mid-throttle and WOT still runs like a dog. The jets are 51. The nut is much tighter than gbauer's suggestion of WOT with just a little left on the pump. The new adjustment should leave a lot more swing on the pump.

Additional tips on setting the accelerator? Do I just try turning it tighter and then looser and see which works best?

Thanks!


Yeah, you had a much older 1bbl than my Monojet. I have one ported vacuum on mine and it runs to the Evap canister. Two full manifold on a tee on the carb, two full manifold on the intake on a tee, and one full vacuum for the EFE (no power brakes). Sounds like the inline 6 has always run the advance off full manifold vacuum. I have an adjustable advance canister I put on my HEI too.


Found an article that is claimed to be written by a GM engineer explaining vacuum advance. In it, he says that the vacuum advance should be connected to full manifold not ported:

http://chevellestuff.net/tech/articles/vacuum/port_or_manifold.htm

I wonder why the Holley instructions tell you to connect the advance to the ported nub?