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Home >> GMC Truck >> 1989 >> V 3500 P/U 4WD V8-454 7.4L >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Engine >> Tune-up and Engine Performance Checks >> Ignition Timing >> Specifications >> Throttle Body Injection (TBI)

Throttle Body Injection (TBI)

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).

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