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Re: Help with timing issue
You are correct re: mechanical advance. The vacuum advance is there to help you out until the rpms kick in. My 62 k20 pulls vacuum from directly above the throttle plate. At part throttle it draws vacuum and advances the breaker plate. You can watch it happen as you rev the throttle. By the time it is wide open, no more vacuum and the breaker plate is back at rest.
My 69 Porsche has vacuum retard. It pulls vacuum from under the butterfly, and when you step on it, the breaker plate springs back to advance. The opposite of the truck.
Both principles are the same. The vacuum assists until centrifugal kicks in.
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