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Home >> GMC >> 1983 >> Magnavan 5.7 L, 475/M40 >> Repair and Diagnosis >> Engine Performance >> System >> Vacuum Advance Spark Control System >> Description >> Spark Vacuum Delay

Spark Vacuum Delay

The spark vacuum delay is used on 5.7L V8 engines with Heavy Duty Emissions. It is installed between TVS check valve and distributor.

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