To find the correct oil capacity, you must identify the specific engine in your vehicle. Look for an engine identification number (VIN) on the engine itself, or consult your vehicle's documentation. Once you know the engine code, you can then find the exact oil capacity in a repair manual specific to your vehicle or a reliable online resource like a parts website (using the engine code) or a dedicated Chevy enthusiast forum.
Without knowing the specific engine, I cannot give you a precise oil capacity.