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Home >> GMC >> 1977 >> Pickup K2500, 5.7L Eng VIN L, Part Time T/Case Control, Trans Mfr CD 162T >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Vacuum Advance Spark Control >> Description >> Spark Control Switch

Spark Control Switch

The spark control switch system is used on 350" and 400" V8 engines with Heavy Duty emissions. It is installed between the TVS check valve and the distributor.

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