I have a obd1 header & i want to know which part of the header tube i can add the bung for the second o2 sensor. I seen a thread on H.T that expalins how & where but i can't find it any more, Some one thats knows Please help me & lead me to the right direction. I know Hasport makes a header for obd0 cars but i don't wana get it, i rather do the work myself.

Thanx in advanced

 

you have to weld 2 on, the one in the back wont work. you weld them in where each pair of cylinders merge, you just have to check block and rad clearance

 

Do you have any pics of it installed ?