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Home >> GMC >> 1985 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> Engine Performance >> Adjustment >> Tune-Up - 4.8L 6-CYL >> Adjustments >> Distributor

Tune-Up - 4.8L 6-CYL: Adjustments: Distributor

All models are equipped with High Energy Ignition (HEI) systems and no adjustments are required.

Fig 1: Firing Order and Timing Marks (Magnetic Probe Located At 10 Degrees ATDC)
G8355