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GMC Truck
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1989
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R 3500 P/U 2WD L6-292 4.8L
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Repair and Diagnosis
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Specifications
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Electrical Specifications
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Ignition Timing
Ignition Timing
Engine 4.8L (292 cid)
Base Timing 8~ TDC (Manual Trans).
Engine 4.8L (292 cid)
Base Timing 8~ TDC (Auto Trans).