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6.0L (VIN U, 8th digit)
- CNG
- gasoline
6.6L turbo diesel (VIN 1, 8th digit)
- California
- Federal
  - opt NF2
  - opt NF4
8.1L (VIN G, 8th digit)

Engine Assembly for 2003 Chevrolet Silverado 2500

Fits: 6.6L turbo diesel VIN 1, 8th digit Federal opt NF4 (change)

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