Tune-Up Procedures - V8: Distributor

All gasoline models are equipped with High Energy Ignition (HEI) system. No adjustment is required. On distributors having a clockwise rotation, as viewed from above, the firing order is 1-5-6-3-4-2-7-8. On distributors having a counterclockwise rotation, the firing order is 1-8-4-3-6-5-7-2.

Fig 1: 350" Firing Order & Timing Mark Identification

Courtesy of GENERAL MOTORS COMPANY

Fig 2: 350" Diesel Firing Order

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Fig 3: 425" Firing Order & Timing Mark Identification (All Except 1978 Eldorado)

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Fig 4: 425" & 500" Firing Order & Timing Mark Identification (1978 Eldorado)

Courtesy of GENERAL MOTORS COMPANY