Timing curves
Some engines require 50* to idle properly [ see below ]. My engine idles with 48* @ 800 in gear & has a smooth idle with a big cam.
Unless you know how to do this electronically, using an adj vac adv connected to manifold vac is the way to have a lot of idle timing........& have the timing drop back to the static amount under load. See the links below.
So if your engine idles best with 35* [ turn dist while idling to get highest rpm ], you can use the factory 12* initial + 23* added with MVA. If your engine wants 36* at WOT, then modify the centri curve accordingly. I would NOT have the centri curve start too early; that requires light springs that may over time cause the weights to stick.
Some engines require 50* to idle properly [ see below ]. My engine idles with 48* @ 800 in gear & has a smooth idle with a big cam.
Unless you know how to do this electronically, using an adj vac adv connected to manifold vac is the way to have a lot of idle timing........& have the timing drop back to the static amount under load. See the links below.
So if your engine idles best with 35* [ turn dist while idling to get highest rpm ], you can use the factory 12* initial + 23* added with MVA. If your engine wants 36* at WOT, then modify the centri curve accordingly. I would NOT have the centri curve start too early; that requires light springs that may over time cause the weights to stick.