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GMC Truck
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1991
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R 3500 P/U 2WD V8-454 7.4L
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Repair and Diagnosis
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Powertrain Management
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Ignition System
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Ignition Timing
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Specifications
Ignition Timing: Specifications
Engine 7.4L (454 cid) VIN N
Base Timing 4~ BTDC (Manual Trans).
Engine 7.4L (454 cid) VIN N
Base Timing 4~ BTDC (Auto Trans).