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Home >> GMC >> 1991 >> C3500 HD 6.2 J, Automatic >> 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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