Distributor Installation - Don't Just Drop It In
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The vacuum lockout plate (arrow) replaces the vacuum advance unit. When the vacuum advance is removed, the pickup coil/reluctor can float around. This will destroy timing. The lockout plate solidly locates the pickup coil. If the vacuum advance unit is left on, even with the hose removed, there can be some slack or move-ment in the spring-loaded diaphragm, resulting in ignition timing bounce. View Related Article
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