Total Timing Vacuum Advance, Do not be surprised to see the timing in the 50+ degree Advance/Retard Range: Vacuum: 8-12deg Adv; Centrifugal: 7-12deg @ 1600rpm, 20-25deg @ 3800rpm The max of 20-25 degrees is the range I'm getting @3500rpm resulting in an idle Quick question for opinions. My initial timing is 10 degrees, TheSamba. The Small block Chevys (and most other GM performance V8 engines) perform best when the total timing (full centrifugal advance plus the initial timing setting with vacuum advance disconnected) is all in by Total timing is base timing (at idle with vacuum advance disconnected) plus mechanical advance from rpm. Mechanical advance and vacuum advance both advance ignition timing but vary in function and results. What is Vacuum Advance? Vacuum advance has absolutely nothing to do with total timing or performance, as when the throttle is opened, manifold vacuum drops essentially to zero, and the vacuum advance drops out entirely; it One crucial aspect of this system is the vacuum advance timing. At part throttle, high manifold vacuum moves the diaphragm in the vacuum advance canister on the distributor Vacuum advance has absolutely nothing to do with total timing or performance, as when the throttle is opened, manifold vacuum drops essentially to zero, and the vacuum advance drops out entirely; it This article aims to clarify the role of vacuum advance in ignition timing and provide an in-depth understanding of its implications on engine performance. I tried medium springs and I tried light springs. The factory specs are normally conservative Timing (with vacuum advance connected to ported vacuum, idling at 1500 rpm's) - 32* Timing (with vacuum advance connected to ported vacuum, idling at 2500 rpm's) - 66* Than vacuum advance can seems to be working fine, just still giving too much advance even on the lowest setting. The amount of advance added by the distributor, combined with initial static timing, is "total timing" (i. my basically stock 390 seems to like 35-36* total timing (initial + mechanical), checked at 3000rpm with vacuum advance disconnected/pluged.

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