Straight from GM:
Active Fuel Management Technology
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With Active Fuel Management technology from GM, the Vortec 5.3L V8 engine standard in LS 4x4 models and all LT and LTZ models as well as the Vortec 6.0L V8...
Actually I haven't be wheeling out here most of those pic's were taken out in Yuma (I got family there). There aren't too many places out here were you can wheel without getting in trouble.
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