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The two timing marks on a 4-cylinder engine's crankshaft or camshaft indicate different reference points for timing adjustments. One mark typically aligns for ignition timing, while the other may be used for valve timing or synchronization with other components. This dual marking helps ensure accurate timing during engine assembly and maintenance, allowing for precise adjustments to optimize engine performance.

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1y ago

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Does a 1998 chevy vortex engine have two timing marks?

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