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Yes 5.3 and you can upgrade to the 6.0 . there is no 4.8 for the tahoe.
6.0 is only on the hybrid (detuned a good bit) or on 2500 suburbans and yukon xls only. 6.0 is not available on your standard ltz tahoe. Only 5.3 or the very rare 6.2 liter.