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I installed an Edelbrock rich/lean indicator and placed the sensor about 3 inches downstream from the collector. It is facing in as close to the frame / body as possible, and has better clearance then the other low spots on the car. All of the modern O2 sensors have heaters built it, and they claim 30 seconds to warm-up and get a good reading.
I will try to get a picture to post.
Roy
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Roy
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