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Home >> GMC >> 1988 >> Forward Control 7.4 W, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Tune-Up >> Ignition System - HEI/Est/ESC >> Adjustments
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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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