To Vacuum Advance or Not to Vacuum Advance

318willrun said

Not kidding, I do not use a vacuum advance on most of my classics. Pure stock, yes. I havn't found a benefit yet, doubt I ever do.... :)

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That's because you generally don't run much cam. As the cam gets bigger, the benefits of vacuum advance become bigger. Especially if you hook it to manifold vacuum and let it pull extra timing at idle.