I just started on a 96 K1500 305 engine with no exhaust and am needing to know where to weld the fittings for 02 sensors. I found 4 plug ins for them on the truck I pulled it from but had no reference where they went due to exhaust was tore off of the one it came out of. I am putting this in a 70 c10 and am lost at where to put them to make sure the computer works the engine in the 70 c10 and what I all I need to do to make it happen.

 

dual exhaust, right? if so, two in the down pipes, as close as you can to manifolds or headers, other two anywhere after catalytic convertors(if you have eliminated them, and you should, put them before mufflers