5.3 or 4.8?
#4
Sticker in the glovebox will contain the engine RPO code. If you don't know your engines (LM7, LQ4, L92, etc, just look look up the codes beginning with L on the glovebox sticker; there aren't that many RPOs beginning with an L. Mine has RPO L9H on the sticker; 6.2-liter VVT non-AFM/DOD FlexFuel V8.
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