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They are about 3 to 4 inches long with an electric wire in the end of them and they are screewed into the exhaust pipe/pipes. Start at the engine on both sides were the exhaust bolts to the engine and work your way back to the muffler and you will find them. You didn't say what year it was. so there might be 4 or just 2 of them in the system.

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Q: Where on the GM 350 vortec engine would you find the oxygen sensor?
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