Quote:
Originally Posted by 40 Deluxe
I found an adjustable vacuum advance unit online (but don't remember the source). It adjusts with an Allen wrench through the vacuum nipple, just like a Ford. In fact, it looks just like a Ford, only with Chevy mounting.
As you tighten the Allen screw (turn clockwise) it compresses the spring to slow the rate of advance and and also reduces the amount of vacuum advance.
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I've had two of those (a Mr Gasket and an Accel, same unit). Both failed within a year or so.