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Home >> Chevrolet >> 1989 >> Forward Control 4.8 T, Automatic, 475/M40 >> Repair and Diagnosis >> Engine Performance >> Ignition System - HEI/Est/ESC >> Wiring Diagrams
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Wiring Diagrams

Fig 1: HEI/EST Ignition System Wiring Diagram (Includes Hall Effect Variant On 2.5L)
G72856Courtesy of GENERAL MOTORS CORP.
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