[Alpha67]

I have to weld a bung on one of my SBC headers for the oxygen sensor. Should it be in one of the primaries near an exhaust port or in the collector tube? Headers are full length and not shorties.
Thanks in advance

[poncho62]

I would think in the collector.....However, I would also try and put it the same distance from the engine as the stock location was.

[Alpha67]

Thanks.
The stock location was at the end of the cast manifold near the eand of the cyl head & under the master cyl. If I put it in the collector, then it will be down under the floor. This will be a considerable distance away from the stock location which concerns me (will it function ok?)

[TMF Lindbeck]

If you are using a heated sensor this should not be a problem if its a one wire you'll need to her a heated sensor and wire it up

[F-BIRD'88]

I put mine on the exhaust pipe just past the headers collector flange.
Use a heated type so it will read at idle. Make sure the exhaust system is not leaking.

[evolvo]

I put mine in the collector, didn't worry about the distance from the stock location, didn't know I had to. It is a heated sensor though so I guess I lucked out. A few years ago the heating element burned out. When I started the car the idle would go from about 800 to 1100, up and down until the sensor got hot, then it would idle correctly.