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Home >> GMC >> 1983 >> Forward Control 7.4 W, Automatic, 400/M40 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Adjustment >> Tune-Up - 5.7L V8 VIN [L] >> Ignition System >> Ignition Timing >> Notes

Ignition Timing: Notes

NOTE: Engines are equipped with a receptacle for magnetic probe timing lights, located 10° ATDC. DO NOT use this location for timing with a conventional light.

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