Editing Hot rodding the HEI distributor (section)
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==Tuning the advance curve for performance== Stock, the HEI distributor advance mechanism is pretty good but the stock springs are too strong, causing the advance curve to come in too slowly, if it ever gets fully advanced at all. Also the amount of advance supplied by the mechanical advance was set up for the specific application it was used on, and this is seldom what's needed for a performance application. Often a stock distributor is set up to rely on the vacuum advance for a large proportion of ignition advance. This isn't what's wanted for a performance timing advance curve. What is needed are the right springs, the right initial advance setting and the right amount of mechanical advance (vacuum advance will be discussed later). Most small block Chevy engines like about 32-38 degrees total advance, all in by 3000 RPM or less if the engine and fuel will allow.
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