Initial timing

Initial timing

Thanks for link, I had actually saved that the other night when I fired up the Googling machine but hadn't read it yet.
So reading that link, I can see reasons for both ported or manifold vac.
My AFB only has manifold vacuum. I wonder if that is part of the problem.
Eddy 1405 gets dirty from old fuel.
I replace with Carter 4295S I redid 4/5 years ago.
It only has manifold vac and the eddy was hooked to ported?
I just hooked up vacuum gauge I had to front port on AFB. 2"hg at idle(650 rpm)
Thanks.

Bewy said
Sorry, Ragtop, you are getting very bad advice.

[1] You DO NOT adjust carb first.
[2] You DO NOT set the WOT timing, & then let initial timing fall where it falls. [ Post #8 ]
[3] When you have been doing this for 40+ yrs you learn a lot, & also from other people.

[1] What you do first is find optimum idle timing, post #7. Idle mixture/speed setting just needs to be in the ball park to find most efficient timing. It should be obvious from the procedure in post #7, that since you are not touching the carb, only ign timing, that this procedure finds the most efficient idle timing for that combo, as shown by the rpm increase [ more hp ]. Once idle timing has been determined, the dist centri curve can be done if used.
[2] Once you have idle timing sorted, THEN you do carb adjusting such as T slot position.
[3] This link will explain MVA benefits & whole lot more about combustion; scroll down to post #6. If it does not load, type in manually.

www.ho trodders.com/forum/vacuum-advance-hooked-up-directly-manifold-bad-47495.html

halfafish said
www.hotrodders.com/forum/vacuum-advance-hooked-up-directly-manifold-bad-47495.html

The link above doesn't work, try this one!