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Firing Order 97 Cadillac De ville 4.6 Eng And the Vin 8th digit is Y 10th V?

The 8th and 10th digits of a Cadillac VIN don't directly determine the firing order. The firing order is determined by the engine's design. A 1997 Cadillac DeVille 4.6L Northstar engine uses a 1-8-7-2-6-5-4-3 firing order.