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Firing Order & Cylinder Identification

NOTE: The 4.8L, 5.3L & 6.0L engines are equipped with a coil for each spark plug which is connected to spark plug with a short high tension wire.

Fig 1: Firing Order (4.3L)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Firing Order (4.8L, 5.3L & 6.0L)

Courtesy of GENERAL MOTORS CORP.