o2 sensor location

[Len Sabatine]

  Place primary O2 Sensor[s] as close to Exh Manifold Flange as practicable 
or if  equipped
  with tube headers , place  in the " transition " where the 4 
primaries  merge into 1.  O2
  switching response degrades the farther it's placed from exh heat 
concentration. HO2s
  will reach and maintain the heat threshold quicker and promote CL 
Quicker. HO2s [better].
   Len

At 10:38 AM 12/16/2000 -0800, you wrote:
>Hello there.
>
>I have a question, I may of asked this before but I don't think that it ever
>got resolved.
>
>next week I'm getting my chevy 350 dual exhaust system striagtened out, I
>have a 350 in a 72 jaguar xj6. I'm having an exhaust shop replace the front
>pipes with better fitting ones and install a crossover pipe after the
>transmission.
>
>it has to be after the transmission becuase due to clearences I don't want
>to cook it.
>
>Should I put my heated o2 sensor in the crossover pipe that far back ? or
>should I put it in one of the header pipes exiting one of the exhaust
>manifolds ?
>
>I have a 3 wire o2 sensor, heated from something or other. I'm worried that
>it might not get hot enough that far back, vs reading only one side of the
>engine.
>
>thanks, Diane
>
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