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Home >> GMC >> 1992 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> C-4, Basic Ignition System Checks (Gasoline) >> HEI-Est Distributor >> Notes

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HEI-Est Distributor: Notes

NOTE: Only basic ignition timing is adjustable in HEI/EST ignition system.

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