On a 2004 GM Aveo, the timing marks are located on the crankshaft and camshaft pulleys. The crankshaft mark is typically a small notch or dot on the pulley, while the camshaft may have a corresponding mark or indicator on the timing cover. When aligning the timing, ensure that these marks are in proper alignment according to the service manual specifications to maintain correct engine timing. Always refer to the vehicle's repair manual for precise details and diagrams.
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