14 Stroker 390 Dyno Test
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9 Here's how to tune the vacuum advance rate on distributors so equipped. An Allen wrench turns the advance rate adjustment inside, which works the same way as a factory Autolite vacuum advance. The more spring pressure you apply with either shims or this adjustment (clockwise), the slower the rate of advance. Take away shims or back off on the adjustment (counterclockwise) to reduce spring pressure, the faster the advance rate. View Related Article
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