[95ramairformula]

At full throttle there is no vacuum advance, its all mechanical advance.

[Peti972]

so what should my vacuum advance timing be? also what about my mechanical advance & what should they be at at which rpm?

[Ben M.]

Originally Posted by Peti972

so what should my vacuum advance timing be? also what about my mechanical advance & what should they be at at which rpm?

Depends on the engine (400 or 403 or 301?). A "general" starting point tends to have 34-38 total advance all in around 2500-3000RPM (subtract initial to get mechanical). Vacuum advance can add as much as 12-14 degrees as well, and if you have EGR operational it is not unheard of to have almost all applied when cruising at part throttle. Your initial timing setting also needs to be factored in (between 10-18 depending on engine). Engine specs and build all factor into these numbers and unless you know for certain the engine combination, tuning, tuning, tuning, and then tuning some more is the best way to determine exactly what your engine likes.