O2 sensor location
11-01-2015, 08:44 PM
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O2 sensor location 
Trying to find out the best location for the O2 sensors on my 5.3 I am using Block Hugger Headers.Would the location pointed out in the picture be ok? 
12-01-2015, 03:51 PM
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If thats coming from where the header meets to the head and that being the flange that would bolt up to the exhaust then that would be a good spot for the upstream. Remember, two O2 sensors means you have an upstream and a downstream, most cases you have one before a cat up near the head on the exhaust or just a little down from it, downstream obviously after the cat.