There are 5 choices

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3.5L
- VIN K (8th digit, opt LZE)
- VIN N (8th digit, opt LZ4)
  - California emissions (opt NU6)
  - Without California emissions
3.9L (VIN R, 8th digit, opt LZ8)
5.3L (VIN C, 8th digit, opt LS4)

Engine Assembly for 2007 Chevrolet Impala

Fits: 3.5L VIN N 8th digit, opt LZ4 California emissions opt NU6 (change)

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