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What kind of mileage are you getting? If those are the original O2's and were transferred from the manifolds to the headers then yeah, they probably should be replaced. Header burn off can mess them up as well as any impact from trying to remove them from the manifolds can hurt as well. I think the correct AC Delco O2's are around $75 each.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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