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Home >> GMC >> 1988 >> Forward Control 6.2 J, Automatic, 400/M40 >> Repair and Diagnosis >> Engine Performance >> Ignition System - HEI/Est/ESC >> Adjustments

Ignition System - HEI/Est/ESC: Adjustments

The only adjustments that can be made to HEI/EST ignition system are basic ignition timing and spark plug gap.

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