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GMC
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1989
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Forward Control 7.4 W, Standard
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Repair and Diagnosis
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Engine Performance
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Adjustment
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Tune-Up - V8
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Adjustments
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Ignition System
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Distributor
Ignition System: Distributor
Engines are equipped with a Delco-Remy HEI solid state distributor. No adjustments are necessary.
Fig 1: Firing Order & Distributor Rotation